configurations: add AssetTag interface

Add AssetTag and SparePartNumber

Change-Id: I0c88412d5bec5a67db30a257194c7188ceae38fb
Signed-off-by: Peter Yin <peter.yin@quantatw.com>
diff --git a/configurations/minerva_pdb.json b/configurations/minerva_pdb.json
index d02e312..1d9498c 100644
--- a/configurations/minerva_pdb.json
+++ b/configurations/minerva_pdb.json
@@ -164,5 +164,8 @@
         "PartNumber": "$BOARD_PART_NUMBER",
         "SerialNumber": "$BOARD_SERIAL_NUMBER",
         "SparePartNumber": "$BOARD_INFO_AM1"
+    },
+    "xyz.openbmc_project.Inventory.Decorator.AssetTag": {
+        "AssetTag": "$PRODUCT_ASSET_TAG"
     }
 }