media: rga: make some functions static

drivers/media/platform/rockchip/rga/rga-hw.c:383:6: warning: no previous prototype for 'rga_cmd_set' [-Wmissing-prototypes]
 void rga_cmd_set(struct rga_ctx *ctx)
      ^~~~~~~~~~~
drivers/media/platform/rockchip/rga/rga.c:359:17: warning: no previous prototype for 'rga_fmt_find' [-Wmissing-prototypes]
 struct rga_fmt *rga_fmt_find(struct v4l2_format *f)
                 ^~~~~~~~~~~~
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/rockchip/rga/rga-hw.c

@@ -380,7 +380,7 @@ static void rga_cmd_set_mode(struct rga_ctx *ctx)
 	dest[(RGA_MODE_CTRL - RGA_MODE_BASE_REG) >> 2] = mode.val;
 }
 
-void rga_cmd_set(struct rga_ctx *ctx)
+static void rga_cmd_set(struct rga_ctx *ctx)
 {
 	struct rockchip_rga *rga = ctx->rga;
 

drivers/media/platform/rockchip/rga/rga.c

@@ -356,7 +356,7 @@ struct rga_fmt formats[] = {
 
 #define NUM_FORMATS ARRAY_SIZE(formats)
 
-struct rga_fmt *rga_fmt_find(struct v4l2_format *f)
+static struct rga_fmt *rga_fmt_find(struct v4l2_format *f)
 {
 	unsigned int i;