arm64: dts: rockchip: Enable USB Host, OTG on px30-enagicam

Engicam EDIMM2.2 and C.Touch 2.0 Kits support USB Host
and OTG ports.

Add support to enable USB on these kits while mounting
px30-core SOM.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Link: https://lore.kernel.org/r/20201109181017.206834-2-jagan@amarulasolutions.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>