drm/amd/display: disable S/G display on DCN 2.1.0

Causes flickering or white screens in some configurations.
Disable it for now until we can fix the issue.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2352
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Yifan Zhang <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: alexdeucher

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -1499,7 +1499,6 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 			    (adev->apu_flags & AMD_APU_IS_PICASSO))
 				init_data.flags.gpu_vm_support = true;
 			break;
-		case IP_VERSION(2, 1, 0):
 		case IP_VERSION(3, 0, 1):
 		case IP_VERSION(3, 1, 2):
 		case IP_VERSION(3, 1, 3):