ASoC: dt-bindings: qcom,q6dsp-lpass-ports: Add USB_RX port

Q6DSP supports handling of USB playback audio data if USB audio offloading
is enabled.  Add a new definition for the USB_RX AFE port, which is
referenced when the AFE port is started.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409194804.3773260-21-quic_wcheng@quicinc.com


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