dt-bindings: usb: Maxim type-c controller device tree binding document

Add device tree binding document for Maxim 33359 Type-C chip driver

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201029063138.1429760-2-badhri@google.com


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