drivers: usb: udc: support numaker m55m1x series soc

This supports nuvoton numaker m55m1x series soc. Besides, it also
has relevant modifications, including:
1. Fix failure to enable HICR48M, which is to clock usbd and phy
2. Support HWINFO for USB device serial number

Signed-off-by: Chun-Chieh Li <ccli8@nuvoton.com>