Freeze AIDL APIs for SC

Ignore-AOSP-First: part of SC finalization

Bug: 188713899
Test: m
Change-Id: Iee18cd05954dc8ea08cc4f985499a70977d1af4f
diff --git a/common/aidl/Android.bp b/common/aidl/Android.bp
index 912bfdc..028c923 100644
--- a/common/aidl/Android.bp
+++ b/common/aidl/Android.bp
@@ -36,5 +36,8 @@
             min_sdk_version: "29",
         },
     },
-    versions: ["1"],
+    versions: [
+        "1",
+        "2",
+    ],
 }