LCD_KCAL: Color Control driver for Nexus 5

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
defconfig: enable LCD KCAL
LCD_KCAL: remove the control bit, I hate it. Also clean up the code a little bit.

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
arm/dt: remove duplicated GPU entries so that users stop bitching around.

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>