dt-bindings: usb: Add binding for Cypress HX3 USB 3.0 family

The HX3 family comes in different variants (up to 4 USB 3.0 ports;
multi-TT), e.g. CYUSB330x/CYUSB331x/CYUSB332x/CYUSB230x.

This initial version of the binding only describes USB related aspects
of the HX3 family, it does not cover the option of connecting the
controller as an i2c slave.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Benjamin Bara <benjamin.bara@skidata.com>
Link: https://lore.kernel.org/r/20230620-hx3-v7-3-f79b4b22a1bf@skidata.com


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