Merge branch 'net-dsa-mxl862xx-mdio-bus-integrity-and-optimization'

Daniel Golle says:

====================
net: dsa: mxl862xx: MDIO bus integrity and optimization

The MxL862xx firmware offers opt-in CRC validation on the MDIO/MMD
command interface to guard against bit errors on the bus.
The driver has not used this until now.

This series enables CRC protection on both the command registers (CRC-6)
and data payloads (CRC-16), and reduces MDIO bus traffic by bulk-zeroing
registers instead of writing zero-valued words individually.
====================

Link: https://patch.msgid.link/cover.1774185953.git.daniel@makrotopia.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>