ASoC: Intel: avs: Count low power streams

Streaming in S0iX differs from SX scenarios. Store the number of
so-called low-power streams to be able to differentiate between the two.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20221027124702.1761002-7-cezary.rojewski@intel.com


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