Merge branch 'net-mdio-mdio-bcm-unimac-optimizations-and-clean-up'

Justin Chen says:

====================
net: mdio: mdio-bcm-unimac: optimizations and clean up

Clean up mdio poll to use read_poll_timeout() and reduce the potential
poll time.
====================

Link: https://lore.kernel.org/r/20231213222744.2891184-1-justin.chen@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>