m7-common: libaudioamp: Add initialization function stubs

Change-Id: I34aad7e268dbb59edb0d6c224f5f95cc75e405fa
Mic fix for Loudspeaker and WhatsApp

This PatchSet fixes the intended functionality to allow bottom mic to function as Primary
Mic for Loudspeaker calls and WhatsApp voice notes.

Change-Id: I58c3ba006c930be51fe31111e036525f9229fb48