Revert "Power_tuna.c scaling squash"

This reverts commit 190aa5c2d6541e3649a697138b6b9b15306a9637.
power_tuna: update to remove hardcoded screen on/off frequencies

Change-Id: Ie1fe34fad98867d760f2a074c9f9a277fd2e5ef0
power_tuna: fix derped logic

Change-Id: I75fd1ee1380d35b5520b1d806ea56fc2a39ea3ce