Add NWS-4000 support.

Based on nonaka@'s porting effort back in 2002.
See announcement on port-newsmips@ for more details:
http://mail-index.netbsd.org/port-newsmips/2018/10/13/msg000231.html

Fix news5000 panic during boot on APbus attach. PR port-newsmips/53626

Discussed with ryo@ (the original author of news5000 support).
Should be pulled up to netbsd-8.

branches: 1.17.158; 1.17.164; 1.17.166;
merge ktrace-lwp.

include "conf/std".

branches: 1.15.16;
add "makeoptions MACHINE_ARCH=..." in std.* for mips ports
where it is constant (to ease cross-building).

branches: 1.14.6;
Remove the explicit `makeoptions MACHINE_ARCH="mipse{b,l}"' for kernel
builds and use the endianness of the toolchain being used to determine
the endianness of the kernel.

Roll the rest of the ports over to the new MI kernel build machinery.
Any problems reported by testers have been fixed, and massive
cross-compiling of kernels has shown that any problems that remain
with actually building kernels are not related to this.

cleanup:
options SPACE TAB
makeoptions TAB
psuedo-device TAB
remove trailing whitespace
replace multiple spaces -> tabs
options "FOO" -> options FOO
options "FOO=bar" -> options FOO=bar
options "FOO=\"bar\"" -> options FOO="\"bar\""

branches: 1.11.4;
For MIPS kernel Makefiles, don't set ENDIAN in std.${MACHINE}. Instead,
explicitly set MACHINE_ARCH to the appropriate thing. Makefile.mips will
then set all of the internal variables it needs to accordingly.

branches: 1.10.4;
Revert back to a machinearch (really cputype) of mips. Put ENDIAN back.

Change arch from mips to mipsel/mipseb as appropriate. Nuke the ENDIAN
makeoption. Key off MACHINE_ARCH for adding -EB/-EL to CFLAGS/AFLAGS/LD/
LINKFLAGS.

Start using a Makefile.mips. Use a combination of makeoptions and
Makefile.sgimips.inc which has sgimips specific stuff.

Remove prefix construction for softdeps. Add SOFTDEP option to GENERIC.

branches: 1.6.4;
Add

prefix ../gnu/sys
cinclude "conf/files.softdep"
prefix

to all std.* files, so that soft dependencies can be activated using
"options SOFTDEP".

branches: 1.5.8; 1.5.14;
clean up kernel/config files files for machVM lossage.

RCS ID police

Enable UVM by default.

Rename NetBSD/news to NetBSD/newsmips.

Initial import of NetBSD/news.