udev: support by-path devlink for multipath nvme block devices
    
    If multipath feature is enabled, nvme block devices may belong to the
    "nvme-subsystem" subsystem, instead of "nvme" subsystem.
    (What a confusing name...)
    
    Then, the syspath is something like the following,
        /sys/devices/virtual/nvme-subsystem/nvme-subsys0/nvme0n1
    Hence, we need to find the 'real parent' device, such as
        /sys/devices/pci0000:00/0000:00:1c.4/0000:3c:00.0/nvme/nvme0
    
    Fixes https://bugzilla.redhat.com/show_bug.cgi?id=2031810.
    Fixes https://bugzilla.redhat.com/show_bug.cgi?id=2124964.
    Replaces #24748.