Add Balcones system

Add Balcones XML based on P10. EM commit:
https://github.com/openbmc/entity-
manager/commit/df8ed5f4e915eecb2b21e6f380b4c431271cd10d

Tested: Verified the symlinks were created on a Balcones system.

Change-Id: I885e984388b30bbf1336f29a62e0408185d312e6
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/item_updater_main.cpp b/item_updater_main.cpp
index efada13..c8d68c1 100644
--- a/item_updater_main.cpp
+++ b/item_updater_main.cpp
@@ -61,6 +61,8 @@
 
     using namespace std::string_literals;
     std::map<std::string, std::vector<std::string>> extensionMap{{
+        {"com.ibm.Hardware.Chassis.Model.Balcones"s,
+         {".BALCONES_XML"s, ".P10"s}},
         {"com.ibm.Hardware.Chassis.Model.BlueRidge2U"s,
          {".BLUERIDGE_2U_XML"s, ".P10"s}},
         {"com.ibm.Hardware.Chassis.Model.BlueRidge4U"s,