Remove references to experimental filesystem

We're at CPP17 everywhere now, no need to keep the
experimental refrerence.

Tested: It builds

Change-Id: I2a3d13ff806261a47da0493be2f24a2b0c361c9f
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/include/Utils.hpp b/include/Utils.hpp
index b4603cb..c90cddb 100644
--- a/include/Utils.hpp
+++ b/include/Utils.hpp
@@ -15,9 +15,8 @@
 */
 
 #pragma once
-#include "filesystem.hpp"
-
 #include <boost/container/flat_map.hpp>
+#include <filesystem>
 #include <fstream>
 #include <iostream>
 #include <nlohmann/json.hpp>