GammaControl: RGB Gamma Control

Based on franciscofranco's gamma control;
(implementation from https://bitbucket.org/morfic/trinity_four)
Reworked to go along with our panels & removed old sysfs.

RGB gamma curve can be shifted by modifying files in:
"/sys/class/misc/gamma_control"

Each gamma value requires 3 values for shifting (red, green, & blue),
i.e:
  echo "25 6 -10" > /sys/class/misc/gamma_control/v255rgb

Make MIPI_DSI_SAMSUNG_OLED & GAMMA_CONTROL dependant on each other;
until all smart_mtp drivers are updated to work without gamma control.

Change-Id: I81d6ff7bfd261d9c52491da157a4e696168dc8f8
Signed-off-by: Luis Cruz <ljc2491@gmail.com>