util: Remove unused strings

Change-Id: Id784ea375f3e76bad02db24ecab0e37665183d6d
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/src/util.hpp b/src/util.hpp
index ddc5454..96c8d25 100644
--- a/src/util.hpp
+++ b/src/util.hpp
@@ -69,9 +69,6 @@
 
 } // namespace mac_address
 
-constexpr auto networkdService = "systemd-networkd.service";
-constexpr auto timeSynchdService = "systemd-timesyncd.service";
-
 template <int family>
 struct FamilyTraits
 {