net: phy: genphy_c45_pma_baset1_setup_master_slave: do no set unknown configuration

commit 7c5a3284e4b69a75fc249cdd16d2890915aa8fd5 from
https://github.com/nxp-auto-linux/linux

Do not change default master/slave forced configuration if no changes was
requested.

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 a04dd88f

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