usb: gadget: udc: replace kzalloc with devm_kzalloc in mv_udc_probe

usb: gadget: udc: replace kzalloc with devm_kzalloc in mv_udc_probe

This driver uses the unified memory management api, so replace
kzalloc with devm_kzalloc to avoid a memory leak.

Reported-by: Dongliang Mu <mudongliangabcd@gmail.com>
Link: https://lore.kernel.org/all/CAD-N9QX5i5toj8cs7DxBjYWtRGf3ZRnfTAf809sFW6iX0Ktfmw@mail.gmail.com
Signed-off-by: Kang Chen <void0red@gmail.com>
Link: https://lore.kernel.org/r/20230225041149.136-2-void0red@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>