usb: gadget: aspeed_udc: Convert to devm_platform_ioremap_resource()

Use devm_platform_ioremap_resource() to simplify code.

Signed-off-by: Yangtao Li <frank.li@vivo.com>
Link: https://lore.kernel.org/r/20230726113816.888-9-frank.li@vivo.com


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