usb typec: mt6360: Add MT6360 Type-C DT binding documentation

Add a devicetree binding documentation for the MT6360 Type-C driver.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://lore.kernel.org/r/1598928042-22115-2-git-send-email-u0084500@gmail.com


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