adds support for vsc8504 phy.
patch have use on 5.4 kernel and has
to be dropped after since phy is supported by
CONFIG_MICROSEMI_PHY on newer LTS kernels.
Tested-by: Johannes Kimmel <fff@bareminimum.eu>
Signed-off-by: Roman Kuzmitskii <damex.pp@icloud.com>
Signed-off-by: maurerr <mariusd84@gmail.com>
