Merge branch 'net-phy-improve-genphy_c45_read_lpa'

Heiner Kallweit says:

====================
net: phy: improve genphy_c45_read_lpa

This series improves genphy_c45_read_lpa:
- Use clause 45 standard register / bit to detect link partner autoneg
  capability.
- Consider that lpa register values may be invalid if "autoneg complete"
  bit isn't set.
====================

Signed-off-by: David S. Miller <[email protected]>