msm_fb: Port HTC MDP color enhancement feature

Ported from HTC One m7-kk-3.4.10-17db3b.

Signed-off-by: Sultanxda <sultanxda@gmail.com>

Conflicts:
	arch/arm/mach-msm/include/mach/board.h
msm8x60_celox: Enable MDP gamma color enhancement

The gamma table in use is from the HTC One M7 panel driver. This makes colors less saturated.

Signed-off-by: Sultanxda <sultanxda@gmail.com>

Conflicts:
	arch/arm/mach-msm/board-msm8x60_celox.c
msm_fb: Move device-specific display drivers to mach-msm

Also disabled mdp4_video_enhance as it does nothing. Moving the device-specific drivers to mach-msm makes it easier to work with the framebuffer drivers.

Signed-off-by: Sultanxda <sultanxda@gmail.com>

Conflicts:
	arch/arm/mach-msm/Kconfig