nouveau: __iomem misannotations

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --cc drivers/gpu/drm/nouveau/nouveau_nvif.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/nvif/driver.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/nvif/object.h
Simple merge