Revert "Adds support for HDMI audio"

b/161293823

This reverts commit 72de9177fe380bda3bb11eea1aa08a243a55d154.

Reason for revert: This CL, while adding a new feature, causes regression in audio functionality. HDMI audio should be added eventually but should be done more carefully.

Change-Id: I175af0dd0a70bf1e8dba6606904489dff6067057