audio: adjust flat level detection threshold

Current BubbleLevel implementation switches between desktop mode
and non desktop mode indication at an andgle of approximately 6 degrees.

Relax this to 12 degrees to avoid false detections: it is better to be in
1 mic mode if not necessary than in 2 mic mode if not applicable.

Bug 7634268.

Change-Id: I698682966559f86136566688265b9823e53e5adf
manta: power: set CPU boost on input to 500ms

Change-Id: I05743cb2fa0706b96e218e413460d6d1362cd03d