arm64: dts: qcom: sm8250-mtp: Add wcd9380 audio codec node

SM8250-MTP has WCD9380 codec for headset playback and capture via
rx and tx macro respectively.
Add node for this device to be able to use it for sound card device.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211006164712.16078-3-srinivas.kandagatla@linaro.org