schemas: Add Inventory.Item.Storage interface

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

Support the BSM with the `xyz.openbmc_project.Inventory.Item.Storage`
interface to label the hardware type.

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

Change-Id: I0655987262cd13aff32b376f8aa8baeff498afa4
Signed-off-by: Ingrid Chen <ingrid.chen.wiwynn@gmail.com>
diff --git a/schemas/openbmc-dbus.json b/schemas/openbmc-dbus.json
index fc733c8..75b4d74 100644
--- a/schemas/openbmc-dbus.json
+++ b/schemas/openbmc-dbus.json
@@ -131,6 +131,10 @@
                         "BMC": {
                             "additionalProperties": false,
                             "type": "object"
+                        },
+                        "Storage": {
+                            "additionalProperties": false,
+                            "type": "object"
                         }
                     }
                 },