Tweak bootpath strings in ofwboot for OpenBIOS used on qemu-system-ppc.

Bump version to denote the visible change.

This makes qemu-system-ppc -M mac99 booting from a harddisk image
using ofwboot installed by installboot(8) with /usr/mdec/bootxx:
---
% qemu-system-ppc --version
QEMU emulator version 9.1.2
Copyright (c) 2003-2024 Fabrice Bellard and the QEMU Project developers
% qemu-system-ppc -M mac99 -drive file=NetBSD-10.1-macppc.img,media=disk,format=raw -nographic

>> =============================================================
>> OpenBIOS 1.1 [Mar 7 2023 22:21]
>> Configuration device id QEMU version 1 machine id 1
>> CPUs: 1
>> Memory: 128M
>> UUID: 00000000-0000-0000-0000-000000000000
>> CPU type PowerPC,G4
milliseconds isn't unique.
Welcome to OpenBIOS v1.1 built on Mar 7 2023 22:21
Trying hd:,\\:tbxi...
Trying hd:,\ppc\bootinfo.txt...
Trying hd:,%BOOT...
>> Not a bootable ELF image
>> switching to new context:

OF_open bootpath=/pci@f2000000/mac-io@c/ata-3@20000/disk@0
read stage 2 blocks: 01234. done!
starting stage 2...

>> NetBSD/macppc OpenFirmware Boot, Revision 1.14 (Mon Jan 13 14:50:50 UTC 2025)
>> Open Firmware version 3.x
>> Open Firmware running in virtual-mode.
prom2boot: bootpath from OF: "/pci@f2000000/mac-io@c/ata-3@20000/disk@0:,%BOOT"
prom2boot: bootpath patched: "/pci@f2000000/mac-io@c/ata-3@20000/disk@0:"
bootline=
Trying /netbsd
11860332+167196 [463456+447084]=0xc570ec
start=0x100000
[ 1.0000000] Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
[ 1.0000000] 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013,
[ 1.0000000] 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023,
[ 1.0000000] 2024
[ 1.0000000] The NetBSD Foundation, Inc. All rights reserved.
[ 1.0000000] Copyright (c) 1982, 1986, 1989, 1991, 1993
[ 1.0000000] The Regents of the University of California. All rights reserved.

[ 1.0000000] NetBSD 10.1 (GENERIC) #0: Mon Dec 16 13:08:11 UTC 2024
[ 1.0000000] mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/macppc/compile/GENERIC
---

branches: 1.15.18; 1.15.24;
- When starting the boot program, cache a bunch of OFW frequently used
ihandles / phandles, rather than fetching them all the time.
- Change the signature of OF_call_method() to take an array of cells for
the inputs and outputs, rather than using variadic arguments. This
makes it much easier to use OF_call_method() when the format of the
arguments passed to a given method are determined at run-time
(due to e.g. #address-cells).
- Properly inform OpenFirmware where the kernel is loaded by using
"claim" on /chosen/memory and, if running in virtual-mode, using
"claim" on /chosen/mmu to reserve the VA, and "map" on /chosen/mmu
to enter the translation. (The kernel is still always mapped VA==PA.)

branches: 1.14.12;
Fix boot failure from installation floppies. PR port-macppc/53103

Also bump version to denote a visible fix.
Should be pulled up to netbsd-8 and netbsd-7.

branches: 1.13.34; 1.13.52; 1.13.58; 1.13.60;
Read the Apple Partition Map to find a default root partition, when the
file name contains no OF path. Tested with OF3 (myself) and OF2 (tsutsui).

branches: 1.12.4; 1.12.6;
- modify a pathname parse function to explicitly return devname and filename
- check floppyboot properly per devname before loadfile(), not in devopen()
- disable LOAD_NOTE on floppyboot to avoid backward seek
- bump revision

Tested floppy boot and IDE boot on Apus2000 with OpenFirmware 2.0.

Fixes PR install/38943 on macppc.

branches: 1.11.78; 1.11.86; 1.11.88;
merge ktrace-lwp.

Support userconf(4) ("boot -c"). Reviewed by Bill Studenmund.

branches: 1.9.2;
Have Locore zero out the bss (which includes our stack) BEFORE
we start calling into C code. Previously we called memset() in our
C code. Unfortunately the compiler would sometimes store local variables
on the statck, which got killed by the memset(). Oops!

Bump version to help track down issues with kernel loading.

branches: 1.7.6;
Should have done this sooner. Bump to version 1.7 to indicate good
alloc.c.

branches: 1.6.4;
Bump version for ustarfs support.

Bump the version numbers of all bootloaders which use loadfile_elfXX() now
that it tries hard to avoid backwards seeks.

branches: 1.4.4; 1.4.6;
Bump version numbers of all bootloaders that use loadfile/ELF, to account for
my changes to symbol loading. I should probably have done this at the time,
but it's better late than never.

branches: 1.3.4;
add new macro BOOT_FLAG() (defined in <sys/boot_flag.h>) - this
maps standard boot flags to corresponding RB_* values
use BOOT_FLAG() in port's MD code as appropriate

as discussed on tech-kern, add new boot flags -v, -q for booting
verbosely or quietly, and corresponding AB_VERBOSE/AB_QUIET
boot flags; also add FreeBSD-compatible bootverbose macro and
NetBSD-specific bootquiet macro

for hpcmips, use new bootverbose instead of it's own hpcmips_verbose

Tested on i386, and to limited extend (compile of affected files) also for
mvme68k, hp300, luna68k, sun3.

branches: 1.2.2;
Use MI loadfile().

branches: 1.1.10;
Initial import of macppc port.