Replace CK_TILE_PIPELINE macros with a common enum

This change replaces pipeline macros like CK_TILE_PIPELINE_COMPUTE_V3,
CK_TILE_PIPELINE_MEMORY, etc in the CK Tile examples with a common enum
called GemmPipeline to reduce code duplication.

include/ck_tile/ops/gemm/pipeline/gemm_pipelines.hpp

@@ -0,0 +1,21 @@
+// Copyright © Advanced Micro Devices, Inc., or its affiliates.
+// SPDX-License-Identifier:  MIT
+
+#pragma once
+
+namespace ck_tile {
+
+enum struct GemmPipeline
+{
+    COMPUTE_ASYNC,
+    COMPUTE_V3,
+    COMPUTE_V4,
+    COMPUTE_V5,
+    COMPUTE_V6,
+    MEMORY,
+    BASIC_V1,
+    BASIC_V2,
+    PRESHUFFLE_V2
+};
+
+} // namespace ck_tile