net: phy: genphy_c45_pma_baset1_read_master_slave: read actual configuration

commit 830ee3aafcf0575e0ebe7d48e42b35935fade5df from
https://github.com/nxp-auto-linux/linux

Since MDIO_PMA_PMD_BT1_CTRL register shows actual configuration (and
forced state configuration is equal to the state), we should show
this configuration for ethtool.

Issue: ALB-10440

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit acb8c5ae

)
Signed-off-by: Zhantao Tang <zhantao.tang@windriver.com>