audio_effects: Add stereowide effect

Change-Id: If2fd5dc082ac94e0ff0d5c91d255adb129e18d40
Enable smart cover option through overlay

Change-Id: Icdcf083b19b2b320ef93b0b3aac4c514c5d1dbdc

Conflicts:
	overlay/frameworks/base/core/res/res/values/config.xml