drm/nouveau/devinit: add interface to check if a mmio access by scripts is ok

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --cc drivers/gpu/drm/nouveau/core/include/subdev/devinit.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/bios/init.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/devinit/base.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/devinit/priv.h
Simple merge