audio: Force audio to Speaker if requested during VOIP call

getDeviceForStrategy is returning AUDIO_DEVICE_OUT_USB even
when setForceUse is called with Speaker during VOIP call.
Actual Intention is to route audio for phone strategy to USB
device even after setForceUse is called with Speaker when not
in voice call. It is supposed to exclude VOIP call too

Added additional check for MODE_IN_COMMUNICATION so that
it returns SPEAKER when setForceUse is called with speaker

Bug: 18758599

Change-Id: I1c51128cc1c7bfce1cf6f1fde60b428d3a9379fc