[KleidiAI] turn on SME2 by default

mcr229 · mcr229 · commit a90757de2d5f · 2025-08-08T16:03:44.000-07:00
ghstack-source-id: 78fc9ba ghstack-comment-id: 3169012717 Pull Request resolved: #13233
diff --git a/backends/xnnpack/cmake/Dependencies.cmake b/backends/xnnpack/cmake/Dependencies.cmake
@@ -36,6 +36,11 @@ set(XNNPACK_ENABLE_AVXVNNI
     OFF
     CACHE BOOL ""
   )
+
+set(XNNPACK_ENABLE_ARM_SME2
+    ON
+    CACHE BOOL ""
+  )
 # Work around observed failure: https://github.com/pytorch/executorch/pull/10362#issuecomment-2906391232
 set(XNNPACK_ENABLE_AVX512VNNIGFNI
   OFF
