Freeze IDnsResolver to v5.

Generated with "m dnsresolver_aidl_interface-freeze-api".

Test: m
Bug: 156914456
Original-Change: https://android-review.googlesource.com/1316174
Merged-In: Ifcf6076d788f601bb3b545704f2d42fd65dfdd54
Change-Id: Ifcf6076d788f601bb3b545704f2d42fd65dfdd54
diff --git a/Android.bp b/Android.bp
index 83bb6bf..c929549 100644
--- a/Android.bp
+++ b/Android.bp
@@ -43,6 +43,7 @@
         "2",
         "3",
         "4",
+        "5",
     ],
 }