AudioEffects: Add center frequency param to bassboost

Change-Id: I91010e30451d88caf9b95deed932b6adebc8377f
audio_effects: Add a stereo widening effect

Change-Id: If38795e201c4ad1704d76c9898cbb02c3f3cc0d1
Revert "audio_route: fix possible segfault"

This reverts commit 84f0b1899302784c679105f444e87686a66c1274.
audio_route: fix crash with unsupported control types

Check if control type is supported before accessing xxx_value
fields in mixer_state structure.

Also remove unused parameter warning.

Change-Id: I9005d4760e55f0798d576bd4507700e198900311
audio_route: Add APIs to update mixer based on path

audio_route_apply_and_update_path
audio_route_reset_and_update_path

These routines allows updating the mixer controls for
just the specified path. The controls will be updated
in the order listed in the XML file.

Change-Id: If193bc047ccbb8c6497926d6181c5c4541a9d6aa
CRs-Fixed: 581453
Merge remote branch 'cm/cm-11.0'