snd_soc_msm_2x: Add decimator 3 and 4 volume handling

- no actual changes to volumes here, just a prerequisite
  for future volume tweaks

Change-Id: Ic1bfe986b5c606bf9d3040394653d6db8fa61417
Increase the camcorder audio volume

Change-Id: If93d1cd0b95fd599c7ec7539a0b7ba484051c2e1