[Why]
This change causes regression for S4 resume where gamma is not
programmed. The change incorrectly updates the requested dpms_off
state.

This reverts commit d2b1d6bb.
Signed-off-by: Eric Yang <Eric.Yang2@amd.com>
Reviewed-by: Yongqiang Sun <yongqiang.sun@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>