hal: Fix improper input device selection for camcorder stereo recording

- Same TX device would be seleted in camcorder and voice call.
- SND_DEVICE_IN_VOICE_SPEAKER_DMIC would be used for speaker mode when
  in call, which was same as camcorder used.Thus, the tuning updation
  in camcorder stereo recording would affect voice call performance.
- Fix by selecting SND_DEVICE_IN_HANDSET_STEREO_DMIC as input devices
  in camcorder, only when the fluence type is dual mic and the channel
  count is 2.

CRs-Fixed: 685263
Change-Id: Iba521f13a3d51e99f0f8ba4d8d4fd721975bc5ae