[CK_TILE] FMHA BWD Remove Unnecessary Padding (#2550)

* Remove unnecessary pssk

* Add BlockFmhaBwdDQDKDVPipeline wrapper

* Resolve copilot comments & Remove kpad & fix

* Remove spad

example/ck_tile/01_fmha/codegen/utils.py

@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2025, Advanced Micro Devices, Inc. All rights reserved.
+# generate kernel instances to speed up compilation
+
+import os.path as path
+
+
+def update_file(file_path, content):
+    """Update the file at file_path with the given content if it differs from the existing content.
+
+    It avoids unnecessary touching of the file which triggers rebuilds
+    """
+
+    existing_content = ""
+    if path.exists(file_path):
+        with open(file_path, "r") as file:
+            existing_content = file.read()
+    if existing_content == content:
+        return
+    with open(file_path, "w") as file:
+        file.write(content)