schemas: Add Decorator.Revision interface

This adds property `Version` under `xyz.openbmc_project.Inventory.
Decorator.Revision` as described in [1]

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

Change-Id: Icd28f56e2dfccd824cee3ff14b6cbbd0ef17303f
Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>
diff --git a/schemas/openbmc-dbus.json b/schemas/openbmc-dbus.json
index 99de989..2819a8f 100644
--- a/schemas/openbmc-dbus.json
+++ b/schemas/openbmc-dbus.json
@@ -75,6 +75,16 @@
                             },
                             "required": ["SlotNumber"],
                             "type": "object"
+                        },
+                        "Revision": {
+                            "additionalProperties": false,
+                            "properties": {
+                                "Version": {
+                                    "type": "string"
+                                }
+                            },
+                            "required": ["Version"],
+                            "type": "object"
                         }
                     },
                     "Item": {