[media] s5p-mfc: Add missing static storage class in s5p_mfc_enc.c file

Fixes the following sparse warnings:
drivers/media/video/s5p-mfc/s5p_mfc_enc.c:1439:5: warning: symbol 'vidioc_s_parm' was not declared. Should it be static?
drivers/media/video/s5p-mfc/s5p_mfc_enc.c:1455:5: warning: symbol 'vidioc_g_parm' 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_enc.c

@@ -1436,7 +1436,8 @@ static const struct v4l2_ctrl_ops s5p_mfc_enc_ctrl_ops = {
 	.s_ctrl = s5p_mfc_enc_s_ctrl,
 };
 
-int vidioc_s_parm(struct file *file, void *priv, struct v4l2_streamparm *a)
+static int vidioc_s_parm(struct file *file, void *priv,
+			 struct v4l2_streamparm *a)
 {
 	struct s5p_mfc_ctx *ctx = fh_to_ctx(priv);
 
@@ -1452,7 +1453,8 @@ int vidioc_s_parm(struct file *file, void *priv, struct v4l2_streamparm *a)
 	return 0;
 }
 
-int vidioc_g_parm(struct file *file, void *priv, struct v4l2_streamparm *a)
+static int vidioc_g_parm(struct file *file, void *priv,
+			 struct v4l2_streamparm *a)
 {
 	struct s5p_mfc_ctx *ctx = fh_to_ctx(priv);