hal: add support to check sva and audio echo reference

EC ref port can be simultaneously set and reset by
audio and SVA use cases. Synchronize enabling/disabling
of EC ref between sthal and audio hal by passing EC ref
enablement/disablement information to each other.
1. When closing input, EC ref does not stop if SVA EC ref
   is active.
2. Pass Audio EC ref status to STHAL, when stopping SVA,
   ensure EC does not stop if Audio EC ref is active.

Change-Id: I67f1f6316ea64e43a21cbf0add90d345a1108d3e