add support MT7628/MediaTek LinkIt Smart 7688
by @hiroshi and me.

branches: 1.5.4; 1.5.8;
Add common support for bringing devices out of reset or enabling their clocks
to device_register. Add code to switch USB to host mode.

branches: 1.4.2; 1.4.10;
split device_t/softc for all remaining drivers.
replace "struct device *" with "device_t".
use device_xname(), device_unit(), etc.

branches: 1.3.2;
Do not call setroot() from MD code and from MI code, which has
unwanted sideeffects in the RB_ASKNAME case. This fixes PR/46732.

No longer wrap MD cpu_rootconf(), as hp300 port stores reboot information
as a side effect. Instead call MI rootconf() from MD code which makes
rootconf() now a wrapper to setroot().

Adjust several MD routines to set the global booted_device,booted_partition
variables instead of passing partial information to setroot().

Make cpu_rootconf(9) describe the calling order.

branches: 1.2.2; 1.2.8;
Bring forward from matt-nb5-mips64. Support for Ralink RT3883 MIPS 74K SoC
from CradlePoint Technology.

branches: 1.1.2;
file autoconf.c was initially added on branch matt-nb5-mips64.

add support MT7628/MediaTek LinkIt Smart 7688
by @hiroshi and me.

branches: 1.2.12; 1.2.30; 1.2.34;
Bring forward from matt-nb5-mips64. Support for Ralink RT3883 MIPS 74K SoC
from CradlePoint Technology.

branches: 1.1.2;
file console.c was initially added on branch matt-nb5-mips64.

Move the at-shutdown call to resettodr() from cpu_reboot() to kern_reboot().

It's a small step, but it's a step.

s/reseting/resetting/

switch all ports to use uvm_init.c:uvm_md_init()

uvm_setpagesize() is now subsumed within this funciton.

add support MT7628/MediaTek LinkIt Smart 7688
by @hiroshi and me.

branches: 1.11.2;
Remove pmapdebug stuff

branches: 1.10.4;
Add some MT7620 support.

branches: 1.9.2;
use cpu_{g,s}etmodel

branches: 1.8.2; 1.8.4;
normalise RCSID handling some.

Remove reduntant/conflicting common declarations.

Fix early console support.

branches: 1.5.2; 1.5.6;
Use cpu_startup_command (and now HWRENA gets properly initialized).

Deal with RTMEMSIZE no longer being defined

Get memsize from SYSCTL_CFG0 register.

Bring forward from matt-nb5-mips64. Support for Ralink RT3883 MIPS 74K SoC
from CradlePoint Technology.

branches: 1.1.2;
file machdep.c was initially added on branch matt-nb5-mips64.