ASoC: q6afe: dt-bindings: add q6afe clock bindings

q6afe exposes various lpass clocks controls via q6dsp q6afe commands.
This patch adds bindings required for this clock controller.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200910135708.14842-2-srinivas.kandagatla@linaro.org


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