Add target for generating aidl mappings

Test: make framework-aidl-mappings
Change-Id: I8a6e2c876a9569477e2919d437ab6684799a029f
Merged-In: If18cf25dbfb1b00d7bd39fd1e1032fd783fea792
diff --git a/Android.bp b/Android.bp
index 79734df..3b115e8 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1687,3 +1687,11 @@
         },
     },
 }
+
+// Creates an index of AIDL methods; used for adding UnsupportedAppUsage
+// annotations to private apis
+aidl_mapping {
+    name: "framework-aidl-mappings",
+    srcs: [":framework-defaults"],
+    output: "framework-aidl-mappings.txt"
+}
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