schemas: Add Inventory.Item.BMC interface

This commit adds the Item.BMC interface as described in [1].

[1] https://github.com/openbmc/phosphor-dbus-interfaces/blob/master/yaml/xyz/openbmc_project/Inventory/Item/Bmc.interface.yaml

Change-Id: I905fb12434df5280e71d7472666ad646c6b74911
Signed-off-by: Ingrid Chen <ingrid.chen.wiwynn@gmail.com>
diff --git a/schemas/openbmc-dbus.json b/schemas/openbmc-dbus.json
index 80005fb..4fa712a 100644
--- a/schemas/openbmc-dbus.json
+++ b/schemas/openbmc-dbus.json
@@ -127,6 +127,10 @@
                         "System": {
                             "additionalProperties": false,
                             "type": "object"
+                        },
+                        "BMC": {
+                            "additionalProperties": false,
+                            "type": "object"
                         }
                     }
                 },