[media] timblogiw: Fix sparse warning

Fixes the below warning:
drivers/media/platform/timblogiw.c:81:31: warning:
symbol 'timblogiw_tvnorms' was not declared. Should it be static?

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/platform/timblogiw.c

@@ -78,7 +78,7 @@ struct timblogiw_buffer {
 	struct timblogiw_fh	*fh;
 };
 
-const struct timblogiw_tvnorm timblogiw_tvnorms[] = {
+static const struct timblogiw_tvnorm timblogiw_tvnorms[] = {
 	{
 		.std			= V4L2_STD_PAL,
 		.width			= 720,