create build system ownership

Author: jathu

CODEOWNERS

@@ -15,10 +15,6 @@
 /backends/vulkan @SS-JIA
 /backends/xnnpack @digantdesai @mcr229
 
-/build @GregoryComer @kirklandsign
-
-/codegen @larryliu0820 @lucylq
-
 /devtools @tarun292 @Gasoonjia
 
 /docs @mergennachin
@@ -41,7 +37,6 @@
 /exir/backend @cccclai @kimishpatel @JacobSzwejbka @tarun292
 /exir @JacobSzwejbka @tarun292 @larryliu0820
 
-
 /extension/android @kirklandsign
 /extension/android_test @kirklandsign
 /extension/apple @shoumikhin
@@ -83,3 +78,11 @@
 /test @larryliu0820 @kirklandsign
 
 /util @tarun292
+
+# Build System -----------------------------------------------------------------
+
+CMakeLists.txt @jathu @larryliu0820 @kirklandsign
+CMakePresets.json @jathu @larryliu0820 @kirklandsign
+
+/codegen @larryliu0820 @lucylq
+/tools/cmake @jathu @larryliu0820 @kirklandsign