Required properties:
- compatible: Should be one of the following
- "at91sam9rl-udc"
- "at91sam9g45-udc"
- "sama5d3-udc"
+ "atmel,at91sam9rl-udc"
+ "atmel,at91sam9g45-udc"
+ "atmel,sama5d3-udc"
- reg: Address and length of the register set for the device
- interrupts: Should contain usba interrupt
- clocks: Should reference the peripheral and host clocks