RESTRICT AUTOMERGE Ignore weak symbol difference in libhidlbase ABI check

The diff_flags make the ABI checker ignore the weak symbol difference
caused by PGO.

Test: make libhidlbase.vendor
Bug: 230076879
Change-Id: Ic1d0090f7472de6e7b1288f0e9f8019f2810f279
diff --git a/Android.bp b/Android.bp
index bd7c1a8..2b9e80f 100644
--- a/Android.bp
+++ b/Android.bp
@@ -112,6 +112,9 @@
     ],
     min_sdk_version: "29",
     afdo: true,
+    header_abi_checker: {
+        diff_flags: ["-allow-adding-removing-weak-symbols"],
+    },
 }
 
 // WARNING: deprecated