kdump-lib-initramfs.sh: move dump related functions to kdump.sh
    
    upstream: fedora
    resolves: bz2003832
    conflict: none
    
    commit a1205effaa98c08974c39c3283d191c70337857a
    Author: Kairui Song <kasong@redhat.com>
    Date:   Thu Aug 5 00:59:29 2021 +0800
    
        kdump-lib-initramfs.sh: move dump related functions to kdump.sh
    
        These dump related functions are only used by dracut-kdump.sh.
    
        Signed-off-by: Kairui Song <kasong@redhat.com>
        Acked-by: Philipp Rudo <prudo@redhat.com>
    
    Signed-off-by: Tao Liu <ltao@redhat.com>