configurations: mtjade: Add NetworkInterface

This commit adds `xyz.openbmc_project.Inventory.Item.NetworkInterface`
with the property `MACAddress` to mtjade.json.

Signed-off-by: Chau Ly <chaul@amperecomputing.com>
Change-Id: I55b7399204ecd418e830c005bf171a7109ca1b2b
diff --git a/configurations/mtjade.json b/configurations/mtjade.json
index 165619c..7a24e34 100644
--- a/configurations/mtjade.json
+++ b/configurations/mtjade.json
@@ -1427,6 +1427,9 @@
                 "com.ampere.Hardware.Chassis.Model.MtJade"
             ]
         },
+        "xyz.openbmc_project.Inventory.Item.NetworkInterface": {
+            "MACAddress": "$BOARD_INFO_AM1"
+        },
         "xyz.openbmc_project.Inventory.Item.System": {}
     }
 ]