usb: dwc3: Fallback to USB power supply if type is unknown

Change-Id: Ic23805f5fc1d49d408a4cd37088fd11f3e37b3ce
usb: dwc3: Set the max speed

Set the gadget's max speed coressponding to the core's max speed.

Change-Id: I4800ab716bf2d4797ad77169d99fc253d581d8f9
Signed-off-by: Devin Kim <dojip.kim@lge.com>
arm/dt: hammerhead: Set the usb max speed to high

Hammerhead supports the high speed for USB maximum speed.

Change-Id: Ifd92a5880672ab845d5ec91d6fdb963f80e66d2d
Signed-off-by: Devin Kim <dojip.kim@lge.com>