msm8660: add routing for VOIP_CALL input stream

Change-Id: I5556f308670c6fe94dd8a82e2cb9484affd5e791
msm8660: use defines instead of "magic" numbers

* use AUDIO_HW_VOIP_SAMPLERATE_8K and AUDIO_HW_VOIP_SAMPLERATE_16K
  for sample rates for voip
* use AUDIO_HW_VOIP_BUFFERSIZE_8K and AUDIO_HW_VOIP_BUFFERSIZE_16K
  for buffer sizes for voip

Change-Id: Iba62c778711a5a9258a8492719dcabed834513dc