net: stmmac: qcom-ethqos: remove ethqos->speed

net: stmmac: qcom-ethqos: remove ethqos->speed

Rather than ethqos_fix_mac_speed() storing the speed in struct
qcom_ethqos and then functions that are only called from here reading
that speed, pass the speed to the called functions instead.

This removes all readers of this struct member, which then allows the
removal of the two places that set its value and the struct member.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/E1u3bYQ-000EcK-9K@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>