m4: voip audio fixes

* add a HiFiVOIP Speaker verb, fixes rx speakerphone
* redo faulty VOIP Line sequence, fixes tx speakerphone
* boost mic volume, it was way too quiet
* use "standard" ACDB IDs, they seem to result in better audio quality
  (subjective, I know)

Change-Id: Ib28b1b1c2570b6dda4db847efd97f607f0fbfc85