Merge branch 'net-phy-remove-mdio_board_info-support-from-phylib'

Heiner Kallweit says:

====================
net: phy: remove mdio_board_info support from phylib

Since its introduction in 2017 mdio_board_info has had only two users:
- dsa_loop (still existing)
- arm orion, added in 2017 and removed with fd68572b57f2 ("ARM: orion5x:
  remove dsa_chip_data references")

So let's remove usage of mdio_board_info from dsa_loop, then support
for mdio_board_info can be dropped from phylib.
====================

Link: https://patch.msgid.link/4ccf7476-0744-4f6b-aafc-7ba84d15a432@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>