[DRIVERS] usb: Fix compile errors and warnings

Signed-off-by: Anup Patel <anup@brainfault.org>
[DRIVERS] rbd: Fix typo in source header

Signed-off-by: Anup Patel <anup@brainfault.org>
[DRIVERS] usb: Stub driver and dts entry for DWC2 USB2.0 controller

Signed-off-by: Anup Patel <anup@brainfault.org>