Move Interface stats map dump to NetworkStatsService

Bug: 217624062
Test: dumpsys netstats, atest NetworkStatsServiceTest
Change-Id: Ie0357a79925c0bbb34aa05442f727c776f434f88
diff --git a/service/native/TrafficControllerTest.cpp b/service/native/TrafficControllerTest.cpp
index 2f5960f..6cb0940 100644
--- a/service/native/TrafficControllerTest.cpp
+++ b/service/native/TrafficControllerTest.cpp
@@ -805,8 +805,7 @@
             "Read value of map -1 failed: Bad file descriptor";
 
     std::vector<std::string> expectedLines = {
-        fmt::format("mCookieTagMap {}", kErrIterate),
-        fmt::format("mIfaceStatsMap {}", kErrIterate)};
+        fmt::format("mCookieTagMap {}", kErrIterate)};
     EXPECT_TRUE(expectDumpsysContains(expectedLines));
 }