arm64: dts: imx8mp: Add DH i.MX8MP DHCOM SoM on DRC02 carrier board

Add support for DH electronics i.MX8MP DHCOM SoM on DRC02 carrier board.
This system is populated with two ethernet ports, two CANs, RS485 and RS232,
USB, capacitive buttons and an OLED display.

Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>