Tuna: overwork liblights

This commit does several things:

- fix sometimes wonky notification LED
- enable battery LED
- battery LED can be turned off and on, as well color change
  for low, normal, full loaded state
- abillity to enable blink on low battery

cheers

Change-Id: I3e9ea25aef48bba80a57517630db09679371b460

Conflicts:
	device.mk

Conflicts:
	device.mk