mdss: mdp: update 3d gamut programming sequence

3D Gamut block programming sequence requires disabling the clock gating
when the tables of the feature are being programmed. Clock gating can be
enabled on the next vsync after the gamut settings have been flushed.
Change implements the recommended programming sequence to resolve image
screen corruption issues.

Change-Id: If99007debb00b358c9d6266dcc2240269b9947aa
Signed-off-by: Gopikrishnaiah Anandan <agopik@codeaurora.org>