arm64: dts: rockchip: add USB2 to rk3588s-rock5a

arm64: dts: rockchip: add USB2 to rk3588s-rock5a

Enable USB2 (EHCI and OCHI mode) support for the Radxa ROCK 5 Model A.
This adds USB support for the on-board WLAN/BT chip, the two USB2
ports, the USB available from the 2x20 connector and the lower USB3
port (in USB2 mode).

The upper USB3 (further away from the PCB) uses the RK3588S USB TypeC
OTG controller for USB2 and USB3 and thus is not supported at all at
the moment.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20230712165106.65603-5-sebastian.reichel@collabora.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>