drm/amdgpu: update yellow carp external rev_id handling

0x1681 has a different external revision id.
Signed-off-by: NAaron Liu <aaron.liu@amd.com>
Reviewed-by: NHuang Rui <ray.huang@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/nv.c

@@ -1236,7 +1236,10 @@ static int nv_common_early_init(void *handle)
 			AMD_PG_SUPPORT_VCN |
 			AMD_PG_SUPPORT_VCN_DPG |
 			AMD_PG_SUPPORT_JPEG;
-		adev->external_rev_id = adev->rev_id + 0x01;
+		if (adev->pdev->device == 0x1681)
+			adev->external_rev_id = adev->rev_id + 0x19;
+		else
+			adev->external_rev_id = adev->rev_id + 0x01;
 		break;
 	default:
 		/* FIXME: not supported yet */