[media] vsp1: declar vsp1_pipeline_stopped() as static

drivers/media/platform/vsp1/vsp1_video.c:517:6: warning: no previous prototype for 'vsp1_pipeline_stopped' [-Wmissing-prototypes]
 bool vsp1_pipeline_stopped(struct vsp1_pipeline *pipe)
      ^
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/vsp1/vsp1_video.c

@@ -514,7 +514,7 @@ static void vsp1_pipeline_run(struct vsp1_pipeline *pipe)
 	pipe->buffers_ready = 0;
 }
 
-bool vsp1_pipeline_stopped(struct vsp1_pipeline *pipe)
+static bool vsp1_pipeline_stopped(struct vsp1_pipeline *pipe)
 {
 	unsigned long flags;
 	bool stopped;