Remove experimental filesystem splice

In order to be compatible with older versions of GCC that did not have
the experimental filesystem moved over to the standard paths, the code
would splice the experimental code into the std namespace. This is no
longer necessary with yocto 2.6 and the latest versions of GCC.

Change-Id: I2db13c52a91456318795819f2d45c3386b4c56d2
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
diff --git a/storagehandler.cpp b/storagehandler.cpp
index 32bb088..55e17f2 100644
--- a/storagehandler.cpp
+++ b/storagehandler.cpp
@@ -15,6 +15,7 @@
 #include <chrono>
 #include <cstdio>
 #include <cstring>
+#include <filesystem>
 #include <ipmid/utils.hpp>
 #include <phosphor-logging/elog-errors.hpp>
 #include <phosphor-logging/log.hpp>
@@ -23,19 +24,6 @@
 #include <string>
 #include <xyz/openbmc_project/Common/error.hpp>
 
-#if __has_include(<filesystem>)
-#include <filesystem>
-#elif __has_include(<experimental/filesystem>)
-#include <experimental/filesystem>
-namespace std
-{
-// splice experimental::filesystem into std
-namespace filesystem = std::experimental::filesystem;
-} // namespace std
-#else
-#error filesystem not available
-#endif
-
 void register_netfn_storage_functions() __attribute__((constructor));
 
 unsigned int g_sel_time = 0xFFFFFFFF;