power: Toggle encoder boost for camera preview

Bug: 11256084
Change-Id: Ia2388bdae597fccf19acb5db2fb59fc50ec6e13c
Merge tag 'android-4.4.1_r1' of https://android.googlesource.com/platform/hardware/qcom/power into kk4.4

Android 4.4.1 Release 1