configurations: add AssetTag interface

Add AssetTag and SparePartNumber

Change-Id: I0c88412d5bec5a67db30a257194c7188ceae38fb
Signed-off-by: Peter Yin <peter.yin@quantatw.com>
diff --git a/configurations/harma_mb.json b/configurations/harma_mb.json
index fe5de73..9a166ad 100644
--- a/configurations/harma_mb.json
+++ b/configurations/harma_mb.json
@@ -998,6 +998,9 @@
         "SerialNumber": "$BOARD_SERIAL_NUMBER",
         "SparePartNumber": "$BOARD_INFO_AM1"
     },
+    "xyz.openbmc_project.Inventory.Decorator.AssetTag": {
+        "AssetTag": "$PRODUCT_ASSET_TAG"
+    },
     "xyz.openbmc_project.Inventory.Item.Board.Motherboard": {
         "ProductId": 1
     }