dt-bindings: usb: rt1719: Add binding for Richtek RT1719

Add binding for Richtek RT1719.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://lore.kernel.org/r/1644421362-32104-2-git-send-email-u0084500@gmail.com


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