jlo: brightness hack for Android 4.2

Level 0 brightness is off, and is the default brightness in
Android 4.2 when waking a device. Android 4.1 ramps up the
brightness from level 0 to level 9 which activates the
backlight. Android 4.2 does not ramp up the brightness so
the backlight stays off. This hack forces the backlight on
at level 0.