Freeze AIDL APIs for SC

Ignore-AOSP-First: part of SC finalization

Bug: 188713899
Test: m
Change-Id: Iee18cd05954dc8ea08cc4f985499a70977d1af4f
diff --git a/power/aidl/Android.bp b/power/aidl/Android.bp
index dbd18fd..c722795 100644
--- a/power/aidl/Android.bp
+++ b/power/aidl/Android.bp
@@ -43,5 +43,6 @@
     },
     versions: [
         "1",
+        "2",
     ],
 }