Updated light sensor driver and display driver
light sensor changes:
updated driver from SGSII (SGH-T989)
added fix for zero value problem

display changes:
changed bl-gamma level conversion now is much better (taken from a more recent driver source of Note2, also to make it easier to adjust brightness sensor lux)
fixed max brightness problem
added one missing lowest brightness level (gamma20)
re-added acl cutoff from stock driver