kdump.sysconfig: make kexec_file_load as default option on arm64
    
    Resolves: bz1895232
    Upstream: Fedora
    Conflict: None
    
    commit 4948fd88d5ff328a69ecc1c1b55e5f09cd65556a
    Author: Pingfan Liu <piliu@redhat.com>
    Date:   Thu Oct 21 10:12:18 2021 +0800
    
        sysconfig: make kexec_file_load as default option on aarch64
    
        Signed-off-by: Pingfan Liu <piliu@redhat.com>
    
    Signed-off-by: Pingfan Liu <piliu@redhat.com>