picassolte: audio: Improve compatibility with "handset"

This makes Skype work when it decides to use a handset even
though our device doesn't have a handset...

Change-Id: I39c7d9f75b4ddf6a94f50c91238144bedc15c6f9

Conflicts:
	audio/audio_platform_info.xml
	audio/mixer_paths.xml