LCD_KCAL: Color Control driver for Nexus 5

Signed-off-by: Paul Reioux <reioux@gmail.com>
LCD KCAL: Fix Gamma max value issue

Major thanks to Yorici Vz for his tireless pursuit of perfection on Nexus 5
Color / Gamma :D

Signed-off-by: Paul Reioux <reioux@gmail.com>