gamma control: WIP expose gamma parameters to sysfs interface

Signed-off-by: faux123 <reioux@gmail.com>

Conflicts:
	drivers/video/msm/mipi_lgit.c

Conflicts:

	drivers/video/msm/mipi_lgit.c

Change-Id: I3c67a0eda6c54c10c1ba893d30703cc5df5c872b
gamma control: fix wip code derps :p

Signed-off-by: faux123 <reioux@gmail.com>
gamma control: add checksum to validate data integrity

Signed-off-by: faux123 <reioux@gmail.com>

Conflicts:
	drivers/video/msm/mipi_lgit.c
gamma control: fix typo derp :(

Signed-off-by: faux123 <reioux@gmail.com>
remove extra

Change-Id: Iafac4f3cbfa2c417cef5447ade455a2d07b3ee8b