media: ti-vpe: cal: Mark cal_camerarx_media_ops with static keyword

Fix the following sparse warning:

drivers/media/platform/ti-vpe/cal-camerarx.c:783:32: warning: symbol 'cal_camerarx_media_ops' was not declared. Should it be static?
Signed-off-by: NZou Wei <zou_wei@huawei.com>
Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/ti-vpe/cal-camerarx.c

@@ -780,7 +780,7 @@ static const struct v4l2_subdev_ops cal_camerarx_subdev_ops = {
 	.pad = &cal_camerarx_pad_ops,
 };
 
-struct media_entity_operations cal_camerarx_media_ops = {
+static struct media_entity_operations cal_camerarx_media_ops = {
 	.link_validate = v4l2_subdev_link_validate,
 };