Add an ABI dump directory for libutils

The ABI dumps add visibility for API changes in a commonly used library.

Test: development/vndk/tools/header-checker/utils/create_reference_dumps.py \
      -libs libutils -products aosp_arm64 \
      -ref-dump-dir system/core/libutils/abi-dumps
Test: m libutils.vendor
Bug: 227282691
Change-Id: I498c62853562a8fc6702bdd622603b6f7d516274

libutils/Android.bp

@@ -170,10 +170,6 @@ cc_defaults {
     min_sdk_version: "apex_inherit",
 
     afdo: true,
-
-    header_abi_checker: {
-        diff_flags: ["-allow-adding-removing-weak-symbols"],
-    },
 }
 
 cc_library {
@@ -184,6 +180,12 @@ cc_library {
         enabled: true,
         support_system_process: true,
     },
+
+    header_abi_checker: {
+        // AFDO affects weak symbols.
+        diff_flags: ["-allow-adding-removing-weak-symbols"],
+        ref_dump_dirs: ["abi-dumps"],
+    },
 }
 
 cc_library {