usb: gadget: add Aspeed generic udc driver

Add Aspeed generic udc driver.
Separate Aspeed udc driver into udc generic device driver
and usbtty device driver.

Signed-off-by: Neal Liu <neal_liu@aspee

usb: gadget: add Aspeed generic udc driver

Add Aspeed generic udc driver.
Separate Aspeed udc driver into udc generic device driver
and usbtty device driver.

Signed-off-by: Neal Liu <neal_liu@aspeedtech.com>
Change-Id: I05766208d05c477359936fe90381e91f86d03e0d

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