[media] media: video: s5p-tv: fix build break

This patch fixes following build break:

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/s5p-tv/mixer_video.c

@@ -16,6 +16,7 @@
 #include <media/v4l2-ioctl.h>
 #include <linux/videodev2.h>
 #include <linux/mm.h>
+#include <linux/module.h>
 #include <linux/version.h>
 #include <linux/timer.h>
 #include <media/videobuf2-dma-contig.h>