Move Timer from init to libbase

Test: boot bullhead
Test: new libbase unit tests

Change-Id: Ic398a1daa1fe92c10ea7bc1e6ac3f781cee9a5b5
diff --git a/init/firmware_handler.cpp b/init/firmware_handler.cpp
index 860b30b..b686885 100644
--- a/init/firmware_handler.cpp
+++ b/init/firmware_handler.cpp
@@ -24,12 +24,12 @@
 #include <string>
 #include <thread>
 
+#include <android-base/chrono_utils.h>
 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/unique_fd.h>
 
-#include "util.h"
-
+using android::base::Timer;
 using android::base::unique_fd;
 using android::base::WriteFully;