ASoC: dt-bindings: google,sc7280-herobrine: Add platform property

Add platform property in sc7280 machine driver bindings for including
platform subnode in dai-links.
This is required for binding the frontend dai driver to do dynamic pcm
routing in ADSP based platforms.

Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1674468802-14834-3-git-send-email-quic_srivasam@quicinc.com


Signed-off-by: Mark Brown <broonie@kernel.org>