drm/rockchip: vop: enable VOP_FEATURE_INTERNAL_RGB on RK3066

The RK3066 does have RGB display output, so it should be marked as such.

Fixes: f4a6de85 ("drm: rockchip: vop: add rk3066 vop definitions")
Cc: stable@vger.kernel.org
Signed-off-by: Val Packett <val@packett.cool>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20240624204054.5524-3-val@packett.cool