Revert "audio/8655: Enabling LPA playback by adding AudioSessionOutLPA class"

This hasn't worked on 7x30 since ICS, and it also requires ION which
most 7x30 devices can not use.

This reverts commit b982f5a7b665873688c6710d53b4f3902a4c2876.

Change-Id: If1f4ba6fbca611baca220e417a4ef5abd8c1c216