drm: make kernel context switch same as for drm git tree.

Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/char/drm/drmP.h b/drivers/char/drm/drmP.h
index 0bbb04f..e31af67 100644
--- a/drivers/char/drm/drmP.h
+++ b/drivers/char/drm/drmP.h
@@ -561,8 +561,7 @@
 	int (*context_dtor) (struct drm_device * dev, int context);
 	int (*kernel_context_switch) (struct drm_device * dev, int old,
 				      int new);
-	void (*kernel_context_switch_unlock) (struct drm_device * dev,
-					      drm_lock_t *lock);
+	void (*kernel_context_switch_unlock) (struct drm_device * dev);
 	int (*vblank_wait) (struct drm_device * dev, unsigned int *sequence);
 	int (*vblank_wait2) (struct drm_device * dev, unsigned int *sequence);
 	int (*dri_library_name) (struct drm_device *dev, char *buf);