Gard reset: Fix the typo in the D-Bus path

The path to the Gard reset should be /org/open_power/control/gard. This
commit adds the missing underscore.

Change-Id: I01284596d7f52c31bf3c11e31ae6b8bd717a3fa4
Signed-off-by: Michael Tritz <mtritz@us.ibm.com>
diff --git a/item_updater.hpp b/item_updater.hpp
index e0c4450..0b430fe 100755
--- a/item_updater.hpp
+++ b/item_updater.hpp
@@ -25,7 +25,7 @@
 using AssociationList =
         std::vector<std::tuple<std::string, std::string, std::string>>;
 
-constexpr auto GARD_PATH = "/org/openpower/control/gard";
+constexpr auto GARD_PATH = "/org/open_power/control/gard";
 
 /** @class GardReset
  *  @brief OpenBMC GARD factory reset implementation.