util: Replace raw struct functions with stdplus

These functions were recently added to stdplus as they are useful across
projects.

Change-Id: Ia383715a253fce71dacc6bc72b1771393e8ed600
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/util.cpp b/util.cpp
index 13a607f..fbe576d 100644
--- a/util.cpp
+++ b/util.cpp
@@ -17,6 +17,7 @@
 #include <phosphor-logging/elog-errors.hpp>
 #include <phosphor-logging/log.hpp>
 #include <stdexcept>
+#include <stdplus/raw.hpp>
 #include <string>
 #include <variant>
 #include <xyz/openbmc_project/Common/error.hpp>
@@ -622,7 +623,7 @@
 
 bool isEmpty(const ether_addr& mac)
 {
-    return equal(mac, ether_addr{});
+    return stdplus::raw::equal(mac, ether_addr{});
 }
 
 bool isMulticast(const ether_addr& mac)