usb: gadget: udc: renesas_usb3: drop unused module alias

Since commit f3323cd0 ("usb: gadget: udc: renesas_usb3: remove R-Car
H3 ES1.* handling") the driver only supports OF probe so drop the unused
platform module alias.

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20250724092006.21216-1-johan@kernel.org


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