msm8974-common: Add missing audio lib (qcompostproc)

Change-Id: Ie22377b5021b7c5f312b27fd446c2ab4f846db7e
msm8974-common: Fix boot jars classpath

Change-Id: Ia0409853277f7ea0409c7bbaf546f25d363fc441
msm8974: Disable HEVC codec

 * Requires a proprietary component and does not work well on 8974
   anyway. Remove it to pass MediaCodecList CTS test.

Change-Id: I0b98f07fadef3e63842597109ea7da1a37ccea8e