schemas: Add Common.UUID interface

This adds UUID to under xyz.openbmc_project.Common in
openbmc-dbus.json which property UUID as described in [1].
This also adds xyz.openbmc_project.Common.UUID to under
EMConfig in global.json so that the interface can be
configured in the board's Entity Manager configuration file.

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

Signed-off-by: Hieu Huynh <hieuh@os.amperecomputing.com>
Change-Id: I62492928c2268c88754b4946d307022ba63e4c01
diff --git a/schemas/openbmc-dbus.json b/schemas/openbmc-dbus.json
index 36f4baf..99de989 100644
--- a/schemas/openbmc-dbus.json
+++ b/schemas/openbmc-dbus.json
@@ -103,6 +103,18 @@
                             "type": "object"
                         }
                     }
+                },
+                "Common": {
+                    "UUID": {
+                        "additionalProperties": false,
+                        "properties": {
+                            "UUID": {
+                                "type": "string"
+                            }
+                        },
+                        "required": ["UUID"],
+                        "type": "object"
+                    }
                 }
             }
         }