arm64: dts: qcom: sm8250: Add nodes for tx and rx macros with soundwire masters

SM8250 has TX and RX macros with SoundWire Controllers to attach with
codecs like WCD938x. Add these nodes for sm8250 mtp audio use case.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211006164712.16078-2-srinivas.kandagatla@linaro.org