power: Various updates to Power HAL

 * New target support, cleanups, new perf version

Change-Id: I4ca66fad1421105863e98d1a9f5a5eba37aa5e0a
init_msm: Add usergroup permission to dynamic_fps node.

HWC will be writing to this sysfs node to set the variable
refresh rate, hence set proper usergroup

Change-Id: If668003463f580050d5843af97bf8f8761eb7f88
power: Initial powerhal for 8939

Change-Id: I46581ada5000dd20f3bed5fedf634447adce4843
power: Additional 8939 tunings

Change-Id: If4372513ec6db89cfb85fa6012bbe1d82fdef4ce