dt-bindings: arm: rockchip: Add Engicam PX30.Core C.TOUCH 2.0

dt-bindings: arm: rockchip: Add Engicam PX30.Core C.TOUCH 2.0

PX30.Core is an EDIMM SOM based on Rockchip PX30 from Engicam.

C.TOUCH 2.0 is a general purpose carrier board with capacitive
touch interface support.

PX30.Core needs to mount on top of this Carrier board for creating
complete PX30.Core C.TOUCH 2.0 board.

Add bindings for it.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200929083217.25406-6-jagan@amarulasolutions.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>