wingray-common: enable trebuchet wallpaper hack by default

Performance on the homescreen is miserable without it.

Change-Id: Ic09d0f323c962d853c3fd4231a45239e08e5c604
wingray-common: power: enable boostpulse for ondemand

And general cleanup.

Change-Id: If6c288473e54b99801e8fd394270a0dda37b6949