drm/nouveau/devinit: allow impl to select its own cold-boot method

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

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

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

diff --cc drivers/gpu/drm/nouveau/core/subdev/devinit/nv04.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/devinit/nv05.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/devinit/nv10.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/devinit/nv1a.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/devinit/nv20.c
Simple merge

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

diff --cc drivers/gpu/drm/nouveau/core/subdev/devinit/nv84.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/devinit/nv98.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/devinit/nva3.c
Simple merge

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

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

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