mako: faux's Gamma Control

Gamma control interface for Nexus4

Signed-off-by: faux123 <reioux@gmail.com>
mako: Gamma control change checksum

Change checksum and made it counter based to just check if all 10 values are present within our range.

Signed-off-by: Harsh Bhanvadia <harsh.slade@gmail.com>