msm_fb: display: add ioctl for mixer info

Add new ioctl to allow user to query mdp mixer detail configuration.

Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Signed-off-by: helicopter88 <johnlemon.lol@gmail.com>

Conflicts:
	drivers/video/msm/mdp4_overlay.c
	include/linux/msm_mdp.h
msm_fb: display: CSC Matrix update support is added

CSC Matrix update support is added for MDP4 VG pipes
to convert  Ycbcr -> RGB format

CRs-fixed: 313601
Change-Id: Ib6fb8f2eab4b1e871a406a3a2d7274fcfdcdd9d1
Signed-off-by: Nagamalleswararao Ganji <nganji@codeaurora.org>
Signed-off-by: helicopter88 <johnlemon.lol@gmail.com>

Conflicts:
	drivers/video/msm/mdp4.h