Revert "audio: libaudioamp: add hooks to open/close for amplifier init"

This reverts commit 5507a6b2fd06e0313df55f8c1bd46296e977f628.

Depends on an incomplete change device-side.

Change-Id: I6ac49669a8e81dacc44804e7dae11c0a8e3ee65d
Merge remote-tracking branch 'upstream/cm-10.2' into cm-10.2