Rockchip VOP couldn't output YUV video format for eDP controller, so
when driver detect connector support YUV video format, we need to hack
it down to RGB888.
Signed-off-by: NYakir Yang <ykk@rock-chips.com>
Acked-by: NMark Yao <mark.yao@rock-chips.com>
Reviewed-by: NTomasz Figa <tomasz.figa@chromium.com>
Reviewed-by: NSean Paul <seanpaul@chromium.org>