ASoC: dt-bindings: lpass: add binding headers for digital codecs

Add header defining for lpass internal digital codecs rx,tx and va
dai node id's.

Signed-off-by: Srinivasa Rao Mandadapu <srivasam@codeaurora.org>
Link: https://lore.kernel.org/r/1633670491-27432-1-git-send-email-srivasam@codeaurora.org


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