Add NS_R_INTERNAL_ERROR item into NsRcode

Bug: 133111380
Test: ./out/host/linux-x86/bin/statsd_testdrive 116
Change-Id: I25e9244c82126cc8f09abe4639c9a0af2164e5f1
diff --git a/core/proto/android/stats/dnsresolver/dns_resolver.proto b/core/proto/android/stats/dnsresolver/dns_resolver.proto
index b7bf384..9eaabfb 100644
--- a/core/proto/android/stats/dnsresolver/dns_resolver.proto
+++ b/core/proto/android/stats/dnsresolver/dns_resolver.proto
@@ -67,6 +67,7 @@
     // NS_R_BADSIG  = 16,
     NS_R_BADKEY = 17;
     NS_R_BADTIME = 18;
+    NS_R_INTERNAL_ERROR = 254;
     NS_R_TIMEOUT = 255;
 }