msm8974: Disable offload of AC3/EAC3

 * This requires a Dolby license to use the decoder found on the DSP.
 * FFMPEG will handle these formats, but a triple fallback is
   currently happening because of the failed offload.

Change-Id: I699e0a170cc189e749459362a954336e69b492ba
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_device_oppo_msm8974-common into kk_mkt