drm/msm/sde: Add 3D gamut support for version 6

This change adds version 6 support for VIG Gamut. There is
no change needed in sde other than updating the version
so version 6 will make a call for version 5.

Change-Id: I934af39cd7d5daa458f05e54c10fa2ab8d7c705f
Signed-off-by: Samantha Tran <samtran@codeaurora.org>