dt-bindings: usb: add the Renesas RZ/N1 USBF controller

The Renesas RZ/N1 USBF controller is an USB2.0 device controller
(UDC) available in the Renesas r9a06g032 SoC (RZ/N1 family).

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230105152257.310642-2-herve.codina@bootlin.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>