stagefrightrecorder: allow not to use tunnel source

Change-Id: I8cb88b8c51e9cbf0eae7b40164a53714a55ec292
qcom-fm: audio: add support for FM feature

For mr1 based qcom fm solution.

Change-Id: Idd5c7a0364710d54809ef5d4c7b2404b22dc4cf6