arm64: dts: rockchip: add lower USB3 port to rock-5b

Enable full support (XHCI, EHCI, OHCI) for the lower USB3 port from
Radxa Rock 5 Model B. The upper one is already supported.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20240408225109.128953-11-sebastian.reichel@collabora.com


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