MAINTAINERS: add the Renesas RZ/N1 USBF controller entry

After contributing the driver, add myself as the maintainer
for Renesas RZ/N1 USBF controller.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230105152257.310642-6-herve.codina@bootlin.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>