Merge branch 'SPDX-tags-for-PHY-and-MDIO-drivers'

Andrew Lunn says:

====================
SPDX tags for PHY and MDIO drivers

This patchset adds SPDX tags to files where the license information is
clear and consistent. It also removes redundent license text when an
SPDX header is present.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>