drm/amd/display: 3.2.256

DC v3.2.256
Summary:
* Fixes null-deref regression after
  "drm/amd/display: Update OPP counter from new interface"
* Fixes display flashing when VSR and HDR enabled on dcn32
* Fixes dcn3x intermittent hangs due to FPO
* Fixes MST Multi-Stream light up on dcn35
* Fixes green screen on DCN31x when DVI and HDMI monitors attached
* Adds DML2 improvements
* Adds idle power optimization improvements
* Accommodates panels with lower nit backlight
* Updates SDP VSC colorimetry from DP test automation request
* Reverts "drm/amd/display: allow edp updates for virtual signal"

Acked-by: Roman Li <roman.li@amd.com>
Signed-off-by: Aric Cyr <aric.cyr@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: AMD-aric

drivers/gpu/drm/amd/display/dc/dc.h

@@ -49,7 +49,7 @@ struct aux_payload;
 struct set_config_cmd_payload;
 struct dmub_notification;
 
-#define DC_VER "3.2.255"
+#define DC_VER "3.2.256"
 
 #define MAX_SURFACES 3
 #define MAX_PLANES 6