hal: Add LVIMFS microphone feature

This feature is only used by slightly older oplus devices
and is necessary for the microphone output to not be
awfully low in all situations except calls.

To enable this feature, include the below parameter to
audio_platform_info.xml that is parsed.

<param key="record_use_ap_lvimfs" value="enable"/>

Change-Id: Ic7fa2eee591aaa9d03decb7481415ec16bc8a6ae