mm-core: Remove double declaration of OMX.qcom.audio.decoder.aac

Summary:
Change-Id: I0d64cde98ab92c48fe9e70d26724c334f22a79f6

Merge remote-tracking branch 'cm/cm-10.2' into merge_cm

Test Plan: test and merge

Reviewers: synergy

Reviewed By: synergy

Differential Revision: http://review.codefirex.com/D410