meta-romulus: Add inventory-cleanup.yaml

The yaml add the "xyz.openbmc_project.Inventory.Item.Chassis" interface
to "/xyz/openbmc_project/inventory/system/chassis" object.

This is needed for bmcweb to correctly get the chassis id in
/redfish/v1/Chassis/.

Tested: Verify that /redfish/v1/Chassis/chassis exists on Romulus with
        this change. It was 404 without this change.

(From meta-ibm rev: 41b829feead473e5541f7d4c3c075e2b1a525c45)

Signed-off-by: Lei YU <mine260309@gmail.com>
Change-Id: Ie091ad32315fb4b4e45d8b35966a7a238dd1d539
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>