ARM: dts: ccimx6ulsbcpro: Add support for Goodix touch controller

The ConnectCore 6UL SBC Pro has an AUO/Goodix LCD accessory kit that is
connected on the LVDS interface through an on-board LVDS transceiver.

This change adds support for the touch interface.

Signed-off-by: Alex Gonzalez <alex.gonzalez@digi.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>