kern: fix minor assembly bugs, avoid unnecessary function call in KScheduler hotloop

kern: fix 32-bit light ipc svc handler asm ...

Nintendo used to do what we were doing because the function wasn't directly in the handler table,
but we've always been directly in the handler table, so we were trashing the last four arguments to light ipc
when called from aarch32. Nothing uses this, but needed to be fixed.

git subrepo push libraries ...

subrepo:
  subdir:   "libraries"
  merged:   "0a0bd74ca"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "0a0bd74ca"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

init: disable fsdev cwd to prevent abort on fsdev usage (fsdev should not be used)

kern: optimize and bring into line with N our pstate.i management

kern: audit (and fix) our hardware maintenance instructions to match official kernel

Unfuck emummc to not corrupt remote on subrepo push. ...

subrepo:
  subdir:   "emummc"
  merged:   "a9d569594"
upstream:
  origin:   "https://github.com/m4xw/emuMMC"
  branch:   "develop"
  commit:   "a9d569594"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

docs: add changelog for 1.2.1

git subrepo push emummc ...

subrepo:
  subdir:   "emummc"
  merged:   "f11d22d74"
upstream:
  origin:   "https://github.com/m4xw/emuMMC"
  branch:   "develop"
  commit:   "f11d22d74"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

git subrepo push libraries ...

subrepo:
  subdir:   "libraries"
  merged:   "13c6987cc"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "13c6987cc"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

ams: bump version to 1.2.1

emummc/fusee: support 13.1.0 FS

sprof: update for 13.1.0 (format version 1)

crypto: implement md5, which now used by sprof

kern: other dmbs in kernel were already dmb ish

kern: implement 13.1.0 kernel changes

kern: simplify random bitmap selection to match latest Nintendo logic

kern: add (and use) generic KSystemControlBase

kern/test: add some scheduler tests (yields work correctly, all non-special priorities are cooperative/not pre-emptive

hos: whoops

hos: better safe than sorry

hos: allow turning off ams extension hard-reqs for unit testing

kern: add toggleable support for 40-bit physaddr caps

util: add trait/macro for is_constexpr_constructible

test: add tests for SetMemoryPermission

kern/test: add wip qemu-virt board support to mesosphere

kernel_ldr: bring initial cache flush in line with Nintendo

kern: reflect nintendo cache management behavior for initial processes

kern: devirtualize KReadableEvent::Reset, KWorkerTask::DoWorkerTask

kern: enable lto for global instants (saves about a page in deduplicated code)