Try to install PHY and MDIO bus drivers explicitly
    
    Resolves: https://issues.redhat.com/browse/RHEL-7028
    Conflict: None
    
    Upstream Status: git@github.com:rhkdump/kdump-utils.git
    
    commit d057153a1c3c36612a14143b29c0ff0be34e4fc2
    Author: Coiby Xu <coxu@redhat.com>
    Date:   Thu Sep 21 11:50:14 2023 +0800
    
        Try to install PHY and MDIO bus drivers explicitly
    
        Resolves: https://issues.redhat.com/browse/RHEL-7028
    
        Currently, nfs dumping fails on some machines that has a dedicated PHY
        driver (dealing with the physical layer) or MDIO bus (connecting the MAC
        to PHY devices) driver. This is because kexec-tools doesn't install
        dedicated PHY or MDIO driver explicitly. Usually a NIC driver shouldn't
        specify the dependency on the needed PHY or MDIO driver because it
        shouldn't a NIC (medium access control, MAC) driver is for dealing with
        the Data link layer and a PHY driver is for physical layer. So as long
        as a MAC driver can talk to the PHY layer via APIs, it shouldn't care
        which PHY driver or device it's talking to. So when the
        dependency on a PHY driver or MDIO driver is not found by dracut's
        instmods, the PHY or MDIO driver won't be installed.
    
        This patch passes =drivers/net/phy and =drivers/net/mdio to dracut's
        instmods which will only install in-use PHY or MDIO driver(s).
    
        Note ideally we should find out which PHY driver is used by a NIC but
        unfortunately currently no universal way can be found
        (/sys/class/net/NIC_NAME/phydev/driver/module can be used to find the
         name of the PHY driver for some NICs but it doesn't exist for some NICs
        like Qualcomm Atheros AR8031). So is it for a MDIO bus driver.
        Fortunately currently no huge memory consumption is found for a PHY or
        MDIO driver.
    
        Fixes: a65dde2d ("Reduce kdump memory consumption by only installing needed NIC drivers")
        Reported-by: Doreen Alongi <dalongi@redhat.com>
        Signed-off-by: Coiby Xu <coxu@redhat.com>
    
    Signed-off-by: Coiby Xu <coxu@redhat.com>