audio: Reject incall record request when mode is not IN_CALL

- If application selects AUDIO_SOURCE_VOICE_CALL when voice call is
  not active, audio HAL is selecting afe-proxy use case which is
  wrong. afe-proxy usecase/device expected to be selected during
  USB Voice call scenario only

- Fix is to fail opening the input stream with
  AUDIO_DEVICE_IN_TELEPHONY_RX or AUDIO_DEVICE_IN_VOICE_CALL if
  current mode is not IN_CALL

CRs-Fixed: 772386
Change-Id: I8ee3e72daec86e26d05b01a117d7a01f7f6b69a8