Revert "msm8974-common: re-enable qcom.hw.aac.encoder"

This reverts commit 83f3bf56494f48e6bdc1165c36f849390365ce59.
Revert "Revert "msm8974-common: Use AwesomePlayer by default""

This reverts commit 8c73d23c89b72f5790b17e86481f170ad2e0060b.