Freeze AIDL APIs for SC

Ignore-AOSP-First: part of SC finalization

Bug: 188713899
Test: m
Change-Id: Iee18cd05954dc8ea08cc4f985499a70977d1af4f
diff --git a/keymaster/aidl/Android.bp b/keymaster/aidl/Android.bp
index b7a261c..c4b6740 100644
--- a/keymaster/aidl/Android.bp
+++ b/keymaster/aidl/Android.bp
@@ -27,5 +27,6 @@
     versions: [
         "1",
         "2",
+        "3",
     ],
 }