hal: Fix for Audio Route issue when sound path changes

- if you make an outgoing call as mp3 playback is runnign with headset,
  Right side of headset is not functional when keep changing sound path
  from headset to speaker
- Fix the issue by separating loop related of disable/enable_snd_device

Bug: 11232052
Change-Id: Id02a6d7221c77cf4003d97749d75a062d8575d02