dt-bindings: usb: usb-nop-xceiv: add wakeup-source property

USB phy may be a system wakeup source, so add wakeup source property
to keep its resource (e.g. power domain) active to make USB remote
wakeup work.

Signed-off-by: Li Jun <jun.li@nxp.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/1666764742-4201-1-git-send-email-jun.li@nxp.com


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