net: phy: genphy_c45_baset1_an_config_aneg: do no set unknown configuration

commit c5328a7d21d0e7f706d63b8aab714bdf3dd0a86d from
https://github.com/nxp-auto-linux/linux



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

Issue: ALB-10440

Fixes: 3da8ffd8 ("net: phy: Add 10BASE-T1L support in phy-c45")
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 a7f0e4be)
Signed-off-by: Zhantao Tang <zhantao.tang@windriver.com>