Merge branch 'at803x-more-generalization'

Christian Marangi says:

====================
net: phy: at803x: even more generalization

This is part 3 of at803x required patches to split the PHY driver
in more specific PHY Family driver.

While adding support for a new PHY Family qca807x it was notice lots
of similarities with the qca808x cdt function. Hence this series
is done to make things easier in the future when qca807x PHY will be
submitted.

Changes v4:
- Fix Smatch warning
Changes v3:
- Rebase on top of net-next
Changes v2:
- Address request from Russell in a previous series on cdt get
  status improvement
====================
Signed-off-by: David S. Miller <davem@davemloft.net>