recovery: Blank screen on init

* Fixes touch on some devices like chiron/sagit

* Some other devices (e.g. most MTK) need this because their kernel driver
  implementations do not perform as expected (initial unblank is only
  happening when altering the panel brightness x -> 0 -> y). In regular
  Android, that "unblanking" is done on boot when the lights HAL loads and
  sets the initial brightness.

Change-Id: I2fffac508d09d07355a7a7f087805b0dceb5f97e