Add trait file for update_moving_average and save_mean_inv_std

include/ck_tile/ops/batchnorm/pipeline/batchnorm_fwd_traits.hpp

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2025, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+namespace ck_tile {
+
+// Traits for batchnorm forward pass configuration
+// These are compile-time flags that create different kernel variants
+template <bool kSaveMeanInvStd_,
+          bool kUpdateMovingAverage_>
+struct BatchnormFwdTraits
+{
+    static constexpr bool kSaveMeanInvStd = kSaveMeanInvStd_;
+    static constexpr bool kUpdateMovingAverage = kUpdateMovingAverage_;
+};
+
+} // namespace ck_tile