hal: Additional checks for dedicated VOIP input

Enable use of dedicated VOIP input devices under the following
conditions:

SND_DEVICE_IN_VOIP_SPEAKER_MIC: If fluence_in_spkr_mode==true, the
device used for VOIP_SPEAKER_MIC is expected to be dualmic (note there
is no separate VOIP_SPEAKER_DMIC). If instead,
fluence_in_spkr_mode==false and a dedicated voip device is desired,
then an echo reference is set.

SND_DEVICE_IN_VOIP_HANDSET_MIC: If fluence_in_voice_call==true, the
device used for VOIP_HANDSET_MIC is expected to be dualmic (note there
is no separate VOIP_HANDSET_DMIC). If instead
fluence_in_voice_call==false and a dedicated voip device is desired,
then an echo reference is set.

SND_DEVICE_IN_VOIP_HEADSET_MIC: Never uses dualmic, so an echo
reference is always set.

Change-Id: Iba2a33f7520b4f03c5857a0c7bd8a30d3d1caedb