audio/msm7x30: #ifdef HTC audio changes

Patchset 1: Initial ifdef
Patchset 2: Get rid of isHTCPhone check
            Finish conditional revert of HTC changes
Patchset 3: More cleanup
            Fix build
Patchset 4: Reorganize start of AudioHardware::AudioHardware()
            and move mVoiceVolume out of HTC ifdef
Patchset 5: Minor changes to the order done in previous patchset
Patchset 6: Actually use mVoiceVolume for non-HTC devices too
Patchset 7: Really fix mVoiceVolume

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: Id3ddfc8d8a22be13b5f56e66f7fa8af3b2bf8bd3