hal: fix no audio issue in voice call

No audio is observed in voice call -> voip -> voice call scenario
since voice usecase is incorrectly stopped when audio mode
MODE_IN_COMMUNICATION is set. This results in not setting the voice
usecase if when the usecase transitions from voip -> voice.

Fix by removing check for MODE_IN_COMMUNICATION in adev_set_mode().
Also update the check for selecting voice devices in select_devices()
to ensure that voice devices are still selected in
voice call -> voip -> voice call scenario.

CRs-Fixed: 966076
Change-Id: I3566705f745247075d6f12b625fcf929970ff507