dt-bindings: usb: tps6598x: Add Apple CD321x compatible

A variant of the TI TPS 6598x Type-C Port Switch and Power Delivery
controller known as Apple CD321x is present on boards with Apple SoCs
such as the M1. Add its compatible to the device tree binding.

Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Link: https://lore.kernel.org/r/20210928155502.71372-2-sven@svenpeter.dev


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