Allow icing targets to be used by the appsearch apex.

Bug: 162450968
Test: Builds

Change-Id: I9ec5c8408000f25133a6fdc572f896670cb0a4e7
diff --git a/java/Android.bp b/java/Android.bp
index b2c915b..fb61c75 100644
--- a/java/Android.bp
+++ b/java/Android.bp
@@ -20,4 +20,5 @@
         "icing-java-proto-lite",
         "libprotobuf-java-lite",
     ],
+    apex_available: ["com.android.appsearch"],
 }