drm: kill drm_map_ofs callbacks

All drivers happily copy&pasted the default implementation without
checking whether this callback is used at all. It's not. Sigh.

Kill it.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/savage/savage_drv.c

@@ -42,7 +42,6 @@ static struct drm_driver driver = {
 	.lastclose = savage_driver_lastclose,
 	.unload = savage_driver_unload,
 	.reclaim_buffers = savage_reclaim_buffers,
-	.get_map_ofs = drm_core_get_map_ofs,
 	.get_reg_ofs = drm_core_get_reg_ofs,
 	.ioctls = savage_ioctls,
 	.dma_ioctl = savage_bci_buffers,