audio-caf: allow targets to toggle QCOM_COMPRESSED_AUDIO_ENABLED flag

Flag forces libalsa to pull compressed audio defines from kernel headers
(in lieu of libalsa-intf/alsa_audio.h)
Change-Id: Ie52a0fc4b512beacca9e5bdd3aeb49bf356f1490
Merge remote-tracking branch 'cm/cm-10.1' into cm-10.1