[media] s5p-mfc: Add missing static storage class to silence warnings

Fixes the following sparse warnings:

drivers/media/video/s5p-mfc/s5p_mfc.c:73:6
	warning: symbol 's5p_mfc_watchdog' was not declared. Should it be static?
drivers/media/video/s5p-mfc/s5p_mfc_opr.c:299:6:
	warning: symbol 's5p_mfc_set_shared_buffer' was not declared. Should it be static?
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/s5p-mfc/s5p_mfc.c

@@ -70,7 +70,7 @@ static void wake_up_dev(struct s5p_mfc_dev *dev, unsigned int reason,
 	wake_up(&dev->queue);
 }
 
-void s5p_mfc_watchdog(unsigned long arg)
+static void s5p_mfc_watchdog(unsigned long arg)
 {
 	struct s5p_mfc_dev *dev = (struct s5p_mfc_dev *)arg;
 

drivers/media/video/s5p-mfc/s5p_mfc_opr.c

@@ -296,7 +296,7 @@ void s5p_mfc_set_dec_desc_buffer(struct s5p_mfc_ctx *ctx)
 }
 
 /* Set registers for shared buffer */
-void s5p_mfc_set_shared_buffer(struct s5p_mfc_ctx *ctx)
+static void s5p_mfc_set_shared_buffer(struct s5p_mfc_ctx *ctx)
 {
 	struct s5p_mfc_dev *dev = ctx->dev;
 	mfc_write(dev, ctx->shm_ofs, S5P_FIMV_SI_CH0_HOST_WR_ADR);