ASoC: q6dsp: audioreach: Add placeholder decoder for compress playback

Add placeholder decoder graph module for compressed playback feature.

Co-developed-by: Mohammad Rafi Shaik <quic_mohs@quicinc.com>
Signed-off-by: Mohammad Rafi Shaik <quic_mohs@quicinc.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230619101653.9750-5-srinivas.kandagatla@linaro.org


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