drm/amdgpu/display: enable scatter/gather display for DCN 3.1.6

Enable scatter/gather display for DCN 3.1.6.
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1481,6 +1481,7 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 		case IP_VERSION(3, 1, 2):
 		case IP_VERSION(3, 1, 3):
 		case IP_VERSION(3, 1, 5):
+		case IP_VERSION(3, 1, 6):
 			init_data.flags.gpu_vm_support = true;
 			break;
 		default: