drm: Add acquire ctx parameter to ->plane_disable

Nouveau had a few direct calls to ->disable_plane, I replaced those
with drm_plane_force_disable. Same story for shmob.

Otherwise no code changes.

Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170322215058.8671-5-daniel.vetter@ffwll.ch
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index e552687..6096233 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -2151,13 +2151,15 @@ EXPORT_SYMBOL(drm_atomic_helper_update_plane);
 /**
  * drm_atomic_helper_disable_plane - Helper for primary plane disable using * atomic
  * @plane: plane to disable
+ * @ctx: lock acquire context
  *
  * Provides a default plane disable handler using the atomic driver interface.
  *
  * RETURNS:
  * Zero on success, error code on failure
  */
-int drm_atomic_helper_disable_plane(struct drm_plane *plane)
+int drm_atomic_helper_disable_plane(struct drm_plane *plane,
+				    struct drm_modeset_acquire_ctx *ctx)
 {
 	struct drm_atomic_state *state;
 	struct drm_plane_state *plane_state;