Add Motherboard property to WFT-Baseboard

This adds the interface.

Tested: It was populated

Change-Id: I0477e16530f5208df395ed0bf298b3012154bff1
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/configurations/WFT Baseboard.json b/configurations/WFT Baseboard.json
index 2b0a28b..9846e44 100644
--- a/configurations/WFT Baseboard.json
+++ b/configurations/WFT Baseboard.json
@@ -2183,5 +2183,6 @@
         "Model": "$BOARD_PRODUCT_NAME",
         "PartNumber": "$BOARD_PART_NUMBER",
         "SerialNumber": "$BOARD_SERIAL_NUMBER"
-    }
+    },
+    "xyz.openbmc_project.Inventory.Item.Board.Motherboard": {}
 }
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