dt-bindings: usb: typec-tcpci: add tcpci fallback binding

The NXP PTN5110 [1] is an TCPCI [2] compatible chip, so add the fallback
binding.

[1] https://www.nxp.com/docs/en/data-sheet/PTN5110.pdf
[2] https://www.usb.org/sites/default/files/documents/usb-port_controller_specification_rev2.0_v1.0_0.pdf

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240222210903.208901-2-m.felsch@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>