configs: msmnile_au: enable auto audio features

Enable hw ext plugin, bus audio as well as audio control
feature flags.
Update pcm and acdb device IDs for playback and hfp in
platform info xml file.
Update TDM dai channel config to six to support
custom topology upmixing.

Change-Id: I0361626817977b5de0d1ebd23c059d404a710940