Add required_for_abi_source_only = True to extension/android:executorch_llama

Differential Revision: D77479748

Pull Request resolved: pytorch#12093

Author: xuhdev

extension/android/BUCK

@@ -5,6 +5,7 @@ oncall("executorch")
 
 non_fbcode_target(_kind = fb_android_library,
     name = "executorch",
+    required_for_source_only_abi = True,
     srcs = [
         "executorch_android/src/main/java/org/pytorch/executorch/DType.java",
         "executorch_android/src/main/java/org/pytorch/executorch/EValue.java",