CSD: Improve the MelProcessor lifecycle.

The MelProcessor lifecycle is now tied to the streaming thread
lifecycle. Whenever there are new patches and tracks for
sound dose we resume/pause the MEL calculation depending on
the track use case and device type.

Test: logging and dumpsys
Bug: 275370058
Change-Id: I9fb90df9ffb991f41f4209483bdafaf2b7474964