[media] s5c73m3: Fix entity function assignment for the OIF subdev

Suppresses warnings like:
s5p-fimc-md camera: Entity type for entity S5C73M3-OIF was not initialized!
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/i2c/s5c73m3/s5c73m3-core.c

@@ -1706,7 +1706,7 @@ static int s5c73m3_probe(struct i2c_client *client,
 	state->oif_pads[OIF_ISP_PAD].flags = MEDIA_PAD_FL_SINK;
 	state->oif_pads[OIF_JPEG_PAD].flags = MEDIA_PAD_FL_SINK;
 	state->oif_pads[OIF_SOURCE_PAD].flags = MEDIA_PAD_FL_SOURCE;
-	oif_sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
+	oif_sd->entity.function = MEDIA_ENT_F_PROC_VIDEO_SCALER;
 
 	ret = media_entity_pads_init(&oif_sd->entity, OIF_NUM_PADS,
 							state->oif_pads);