drm/amd/display: Set all update flags when we have full update

To prevent future optimization related bugs, just set all update
flags when we have a full update, since we know we want to reprogram
everything in that case.

Signed-off-by: Eric Yang <Eric.Yang2@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>