[KleidiAI] turn on SME2 by default

mcr229 · mcr229 · commit 1fa51ae6470b · 2025-08-11T16:49:18.000-07:00
ghstack-source-id: 675f2ec ghstack-comment-id: 3169012717 Pull Request resolved: #13233
diff --git a/backends/xnnpack/cmake/Dependencies.cmake b/backends/xnnpack/cmake/Dependencies.cmake
@@ -38,6 +38,10 @@ set(XNNPACK_ENABLE_AVXVNNI
 )
 # Work around observed failure:
 # https://github.com/pytorch/executorch/pull/10362#issuecomment-2906391232
+set(XNNPACK_ENABLE_ARM_SME2
+    ON
+    CACHE BOOL ""
+  )
 set(XNNPACK_ENABLE_AVX512VNNIGFNI
     OFF
     CACHE BOOL ""
