drm/rockchip: vop: Add directly output rgb feature for px30

Add this feature bit indicate px30 vop can directly output
parallel or serial rgb data.
Signed-off-by: Sandy Huang <hjc@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20180830211207.10480-4-heiko@sntech.de

drivers/gpu/drm/rockchip/rockchip_vop_reg.c

@@ -276,6 +276,7 @@ static const struct vop_win_data px30_vop_big_win_data[] = {
 
 static const struct vop_data px30_vop_big = {
 	.intr = &px30_intr,
+	.feature = VOP_FEATURE_INTERNAL_RGB,
 	.common = &px30_common,
 	.modeset = &px30_modeset,
 	.output = &px30_output,
@@ -290,6 +291,7 @@ static const struct vop_win_data px30_vop_lit_win_data[] = {
 
 static const struct vop_data px30_vop_lit = {
 	.intr = &px30_intr,
+	.feature = VOP_FEATURE_INTERNAL_RGB,
 	.common = &px30_common,
 	.modeset = &px30_modeset,
 	.output = &px30_output,