Flat map all the things

In an earlier commit, entity-manager gained required dependency
on std::flat_map.  This means that EM can only compile with gcc-15,
which the project only recently moved to.  Rather than move backwards,
port forward all uses of boost flat_map and flat_set to their std
equivalents.

Tested: entity-manager launches and enumerates devices on
gb200-obmc.

Change-Id: Id24803057711c60d5b00f436db80b27edbb756a3
Signed-off-by: Ed Tanous <etanous@nvidia.com>
diff --git a/src/entity_manager/perform_probe.hpp b/src/entity_manager/perform_probe.hpp
index 69c5375..0fdf674 100644
--- a/src/entity_manager/perform_probe.hpp
+++ b/src/entity_manager/perform_probe.hpp
@@ -2,21 +2,13 @@
 
 #include "perform_scan.hpp"
 
-#include <boost/container/flat_map.hpp>
-
+#include <flat_map>
 #include <memory>
 #include <string>
 #include <vector>
 
 namespace probe
 {
-struct CmpStr
-{
-    bool operator()(const char* a, const char* b) const
-    {
-        return std::strcmp(a, b) < 0;
-    }
-};
 
 // underscore T for collison with dbus c api
 enum class probe_type_codes