linux-imx

staging: dpaa2-mac: add link up/down events for dpmac

Fix a limitation that affects the networking behavior when the user
issues ifconfig down/up on a DPNI and the link remains down.
The actual problem was that the mac driver was not aware of the
dpni link change event. Now, the event is sent by firmware and
phylib state machine is manipulated conveniently.

Signed-off-by: Florin Chiculita <florinlaurentiu.chiculita@nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>