ASoC: tegra: Add binding doc for ASRC module

This patch adds YAML schema for DT bindings of Asynchronous Sample Rate
Converter (ASRC) module. It will be registered as an ASoC component and
can be plugged into an audio path as per need via ALSA mixer controls.
The bindings are applicable on Tegra186 and later where the ASRC device
is present.

Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Link: https://lore.kernel.org/r/1648735412-32220-2-git-send-email-spujar@nvidia.com


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