arm64: dts: rockchip: px30: Add Engicam EDIMM2.2 Starter Kit

arm64: dts: rockchip: px30: Add Engicam EDIMM2.2 Starter Kit

Engicam EDIMM2.2 Starter Kit is an EDIMM 2.2 Form Factor Capacitive
Evaluation Board.

Genaral features:
- LCD 7" C.Touch
- microSD slot
- Ethernet 1Gb
- Wifi/BT
- 2x LVDS Full HD interfaces
- 3x USB 2.0
- 1x USB 3.0
- HDMI Out
- Mini PCIe
- MIPI CSI
- 2x CAN
- Audio Out

SOM's like PX30.Core needs to mount on top of this Evaluation board
for creating complete PX30.Core EDIMM2.2 Starter Kit.

Add support for it.

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