mdnie lite control: initial control interface

Compatible with mdnie lite engine used by samsung qualcomm variants i9505/n9005.

sysfs controls for RGBYCMWK channel and "sharpen" effect:
[/sys/class/mdnie/mdnie/control_*]

[echo 255 150 75 > /sys/class/mdnie/mdnie/control_red]
(255 = red; 150 = green; 75 = blue)

override for all samsung modes and profiles:
[echo 1 > /sys/class/mdnie/mdnie/control_override]

Copy color profile from mdnie mode:
(echo x > /sys/class/mdnie/mdnie/control_copy)

where X equals :
- 0 = Standard
- 1 = Natural
- 2 = Movie

(Dynamic uses Standard color profile + Dynamic gamma curve)
(Auto is the same as Standard)

copy gamma curve from existing mdnie profile:
[echo x > /sys/class/mdnie/mdnie/control_curve]

where X equals :
- 0 = Movie
- 1 = Dynamic

Idea based on (mDNIe colour and brightness control) by AndreiLux.
Also thanks to Yank555.lu for his hijack and gamma/mode copy code.