Merge branch 'net-at803x-cleanups'

Christian Marangi says:

====================
net: phy: at803x: additional cleanup for qca808x

This small series is a preparation for the big code split. While the
qca808x code is waiting to be reviwed and merged, we can further cleanup
and generalize shared functions between at803x and qca808x.

With these last 2 patch everything is ready to move the driver to a
dedicated directory and split the code by creating a library module
for the few shared functions between the 2 driver.

Eventually at803x can be further cleaned and generalized but everything
will be already self contained and related only to at803x family of PHYs.
====================

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