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

Change-Id: I64e8cafad3e5eb872f2924eabde9b5dbfc947710
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
Revert "Revert "audio: libaudioamp: add hooks to open/close for amplifier init""

This reverts commit d29144f22c0269ae223db8fb3545962526e0a0c9.

Change-Id: Ia1434020a8719002a6a0096a0661b628ed400ca3