libstagefright: conditionally expose support for QCOM HW AAC decoder

Change-Id: Ifcbd89ef5cf84c18e53fc16abc53b9b807f73eb2
Fix typo

Change-Id: I40b5e5c2aaba23f127d768a61dafccba048a45b4
Merge pull request #7 from CyanogenMod/cm-10.2

cm commits