net: txgbe: Correct the currect link settings

For AML 25G/10G devices, some of the information returned from
phylink_ethtool_ksettings_get() is not correct, since there is a
fixed-link mode. So add additional corrections.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/C94BF867617C544D+20250521064402.22348-7-jiawenwu@trustnetic.com


Signed-off-by: Paolo Abeni <pabeni@redhat.com>