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/global.json b/schemas/global.json
index 355c3c9..e05f2bf 100644
--- a/schemas/global.json
+++ b/schemas/global.json
@@ -134,6 +134,9 @@
                 },
                 "xyz.openbmc_project.Inventory.Item.BMC": {
                     "$ref": "openbmc-dbus.json#/$defs/xyz/openbmc_project/Inventory/Item/BMC"
+                },
+                "xyz.openbmc_project.Inventory.Item.Storage": {
+                    "$ref": "openbmc-dbus.json#/$defs/xyz/openbmc_project/Inventory/Item/Storage"
                 }
             },
             "required": ["Exposes", "Name", "Probe", "Type"]