power: Toggle encoder boost for camera preview

Bug: 11256084
Change-Id: Ia2388bdae597fccf19acb5db2fb59fc50ec6e13c
Merge tag 'android-4.4.1_r1' into HEAD

Android 4.4.1 Release 1
power: Skip build if perf enabled

Change-Id: Ia20f3ef8752d6df674ed9d7850cc9dc271638e58