drm: kill dev->ctx_start and dev->lck_start

Again completely unused, so just remove it.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@gmail.com>

drivers/gpu/drm/drm_fops.c

@@ -80,9 +80,6 @@ static int drm_setup(struct drm_device * dev)
 	dev->last_checked = 0;
 	dev->if_version = 0;
 
-	dev->ctx_start = 0;
-	dev->lck_start = 0;
-
 	dev->buf_async = NULL;
 	init_waitqueue_head(&dev->buf_readers);
 	init_waitqueue_head(&dev->buf_writers);

include/drm/drmP.h

@@ -1170,8 +1170,6 @@ struct drm_device {
 	spinlock_t event_lock;
 
 	/*@} */
-	cycles_t ctx_start;
-	cycles_t lck_start;
 
 	struct fasync_struct *buf_async;/**< Processes waiting for SIGIO */
 	wait_queue_head_t buf_readers;	/**< Processes waiting to read */