configurations: yosemite4: Support SD with Motherboard interface

Add a Motherboard interface on the SD board to label the hardware type.

Change-Id: Ifa0a77799d5bd9cec5869489aa4349fdc375b6b2
Signed-off-by: Ingrid Chen <ingrid.chen.wiwynn@gmail.com>
diff --git a/configurations/yosemite4_sentineldome_t2_retimer.json b/configurations/yosemite4_sentineldome_t2_retimer.json
index effe42d..ca27594 100644
--- a/configurations/yosemite4_sentineldome_t2_retimer.json
+++ b/configurations/yosemite4_sentineldome_t2_retimer.json
@@ -427,5 +427,8 @@
     },
     "xyz.openbmc_project.Inventory.Decorator.Slot": {
         "SlotNumber": "$bus % 15"
+    },
+    "xyz.openbmc_project.Inventory.Item.Board.Motherboard": {
+        "ProductId": 1
     }
 }