Enable the graphics-related options needed by Rockchip boards.
This includes the pwm-backlight which will be needed by the internal
displays used on Gru Chrome-devices.
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>
Reviewed-by: NMark yao <mark.yao@rock-chips.com>
Signed-off-by: NOlof Johansson <olof@lixom.net>