drm: RIP mode_config->rotation_property

Now that all drivers have been converted over to the per-plane rotation
property, we can just nuke the global rotation property.

v2: Rebase due to BIT(),__builtin_ffs() & co.
    Deal with superfluous code shuffling

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1477077768-4274-4-git-send-email-ville.syrjala@linux.intel.com
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index e0d428f..83dbae0 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -392,15 +392,10 @@
 		if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 			drm_plane_force_disable(plane);
 
-		if (plane->rotation_property) {
+		if (plane->rotation_property)
 			drm_mode_plane_set_obj_prop(plane,
 						    plane->rotation_property,
 						    DRM_ROTATE_0);
-		} else if (dev->mode_config.rotation_property) {
-			drm_mode_plane_set_obj_prop(plane,
-						    dev->mode_config.rotation_property,
-						    DRM_ROTATE_0);
-		}
 	}
 
 	for (i = 0; i < fb_helper->crtc_count; i++) {