dt-bindings: usb: Introduce GPIO-based SBU mux

Introduce a binding for GPIO-based mux hardware used for connecting,
disconnecting and switching orientation of the SBU lines in USB Type-C
applications.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
Link: https://lore.kernel.org/r/20230113041115.4189210-1-quic_bjorande@quicinc.com


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