[media] exynos-gsc: Add missing static storage class specifiers

Fixes the following warnings:
drivers/media/platform/exynos-gsc/gsc-core.c:313:5: warning:
symbol 'get_plane_info' was not declared. Should it be static?
drivers/media/platform/exynos-gsc/gsc-core.c:746:28: warning:
symbol 'gsc_ctrl_ops' was not declared. Should it be static?
drivers/media/platform/exynos-gsc/gsc-m2m.c:102:5: warning:
symbol 'gsc_fill_addr' was not declared. Should it be static?
drivers/media/platform/exynos-gsc/gsc-m2m.c:252:16: warning:
symbol 'gsc_m2m_qops' was not declared. Should it be static?

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/platform/exynos-gsc/gsc-core.c b/drivers/media/platform/exynos-gsc/gsc-core.c
index 90a6c55..bfec9e6 100644
--- a/drivers/media/platform/exynos-gsc/gsc-core.c
+++ b/drivers/media/platform/exynos-gsc/gsc-core.c
@@ -310,7 +310,7 @@
 	return 0;
 }
 
-u32 get_plane_info(struct gsc_frame *frm, u32 addr, u32 *index)
+static u32 get_plane_info(struct gsc_frame *frm, u32 addr, u32 *index)
 {
 	if (frm->addr.y == addr) {
 		*index = 0;
@@ -743,7 +743,7 @@
 	return ret;
 }
 
-const struct v4l2_ctrl_ops gsc_ctrl_ops = {
+static const struct v4l2_ctrl_ops gsc_ctrl_ops = {
 	.s_ctrl = gsc_s_ctrl,
 };