soc: dt-bindings: qcom: apr: convert to yaml

Convert APR bindings to yaml format so that we could add new bindings support.

All the dsp services bindings are now part of apr bindings instead
of adding them to audio bindings.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210927135559.738-2-srinivas.kandagatla@linaro.org