Move Stopwatch to libnetdutils

Move Stopwatch to libnetdutils as it is an useful utility across
netd and the resolver library.

Bug: 128662167
Test: system/netd/tests/runtests.sh passed

Change-Id: Iebaffc66202fbe3a787ca645847762af1ed94bd7
diff --git a/server/Controllers.cpp b/server/Controllers.cpp
index 5cf4e06..c3b549f 100644
--- a/server/Controllers.cpp
+++ b/server/Controllers.cpp
@@ -18,8 +18,9 @@
 #include <set>
 #include <string>
 
-#include <android-base/strings.h>
 #include <android-base/stringprintf.h>
+#include <android-base/strings.h>
+#include <netdutils/Stopwatch.h>
 
 #define LOG_TAG "Netd"
 #include <log/log.h>
@@ -28,15 +29,15 @@
 #include "IdletimerController.h"
 #include "NetworkController.h"
 #include "RouteController.h"
-#include "Stopwatch.h"
-#include "oem_iptables_hook.h"
 #include "XfrmController.h"
+#include "oem_iptables_hook.h"
 
 namespace android {
 namespace net {
 
-using android::base::StringPrintf;
 using android::base::StringAppendF;
+using android::base::StringPrintf;
+using android::netdutils::Stopwatch;
 
 auto Controllers::execIptablesRestore  = ::execIptablesRestore;
 auto Controllers::execIptablesRestoreWithOutput = ::execIptablesRestoreWithOutput;