alsa_audio: route call voice to phone when on HDMI

Currently call voice is routed to HDMI rx/tx when HDMI cable is plugging.  So
call voice is muted.  MO/MT call voice routes to speaker/back-mic and
communication routes to HDMI rx/back-mic when HDMI cable is plugging.

Bug: 7218296
Change-Id: I53fc4d5b77ad6502a32c4e8d06e17141e2aa4be2
Signed-off-by: Iliyan Malchev <malchev@google.com>