engicam: px30: Add Engicam PX30.Core C.TOUCH 2.0 10.1" OF

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.

10.1" OF is a capacitive touch 10.1" Open Frame panel solutions.

PX30.Core needs to mount on top of C.TOUCH 2.0 carrier with pluged
10.1" OF for creating complete PX30.Core C.TOUCH 2.0 10.1" Open Frame.

Add support for it.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>