audio: fix audio drop when speaker is selected

When changing audio path to speaker while playback is active,
several hundred ms of audio are dropped. This is mostly noticeable
when a ringtone starts playing.

This change is a workaround forcing the output in standby when speaker
is selected.

The root cause must still be indentified and fixed.

Change-Id: Idef8dc1cdbf2da499a414d0b60244f91ef66e73b
1 file changed