audio: Support for mxmf file playback

-mxmf files couldn't be played.
-Added a condition check, in DLSParser(), to warn user if artCount is 0 and
 to use default articulations.

CRs-Fixed: 465437
Change-Id: I42b1634c65e3779ee7924913cc17020bde9cc38d
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_external_sonivox into kitkat