dt-bindings: usb: mtu3: add wakeup interrupt

Add an dedicated interrupt which is usually EINT to support runtime PM,
meanwhile add "interrupt-names" property, for backward compatibility,
it's optional and used when wakeup interrupt exists

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1626340078-29111-5-git-send-email-chunfeng.yun@mediatek.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>