alsa_sound: fix for output device routing during video chat

Bug: 7163358

- Output device for MODE_IN_COMMUNICATION could be earpiece
  or speaker, do not update output device in switchDevice()
  if input device is BUILTIN_MIC

Change-Id: I2a97a63f4cb57ef114695d3fd917282612b7a346
Signed-off-by: Iliyan Malchev <malchev@google.com>