arm64: dts: rockchip: rockpro64 dts add usb regulator

vcc5v0_host and vcc5v0_typec is supplied by vcc5v0_usb and not vcc5v0_sys.
add node for vcc5v0_usb fixed regulator.

Signed-off-by: Akash Gajjar <Akash_Gajjar@mentor.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>