drm/gm107/devinit: initial implementation

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

diff --cc drivers/gpu/drm/nouveau/Makefile
Simple merge

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

diff --cc drivers/gpu/drm/nouveau/core/subdev/devinit/gm107.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/devinit/nv50.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/devinit/nvc0.c
Simple merge