dt-bindings: usb: Add Parade PS8830 Type-C retimer bindings

The Parade PS8830 is a USB4, DisplayPort and Thunderbolt 4 retimer,
controlled over I2C. It usually sits between a USB/DisplayPort PHY and the
Type-C connector, and provides orientation and altmode handling.

Currently, it is found on all boards featuring the Qualcomm Snapdragon
X Elite SoCs.

Document bindings for its new driver. Future-proof the schema for the
PS8833 variant, which seems to be similar to PS8830.

Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20250206-x1e80100-ps8830-v6-1-60b1e49cfa8d@linaro.org


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