soc: fsl: qbman: allow registering a device link for the portal user

Introduce the API required to make sure that the devices that use
the QMan portal are unbound when the portal is unbound.

Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>