ARM: multi_v7_defconfig: Enable new Rockchip display-controller drivers

Three types of display controller-drivers where added recently. The
Analogix Displayport variant and Designware MIPI DSI used for example
on the rk3288 as well as the Innosilicon HDMI controller used on the
rk3036.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Olof Johansson <olof@lixom.net>