dt-bindings: usb: atmel,at91sam9rl-udc: convert to DT schema

dt-bindings: usb: atmel,at91sam9rl-udc: convert to DT schema

Convert Atmel High-Speed USB Device Controller (USBA) binding to DT schema.
Changes during conversion:
- Make the "clock-names" property flexible enough to accept the items
  in any order as the existing in tree DTS nodes doesn't follow an order.

Signed-off-by: Charan Pedumuru <charan.pedumuru@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260327-atmel-usb-v4-5-eb8b6e49b29d@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>