kdumpctl: enable secure boot on ppc64le LPARs
    
    Resolves: bz1931802
    Upstream: Fedora
    Conflict: The upstream commit was submitted before shfmt and .editorconfig.
              So there are issues like 4 spaces verse tab indentation, double
              brackets verse single bracket and etc.
    
    commit 596fa0a07f089a9dd54cf631124d88653b4d77ec
    Author: Pingfan Liu <piliu@redhat.com>
    Date:   Thu Feb 18 14:01:18 2021 +0800
    
        kdumpctl: enable secure boot on ppc64le LPARs
    
        On ppc64le LPAR, secure-boot is a little different from bare metal,
        Where
          host secure boot: /ibm,secure-boot/os-secureboot-enforcing DT property exists
        while
          guest secure boot: /ibm,secure-boot >= 2
    
        Make kexec-tools adapt to LPAR
    
        Signed-off-by: Pingfan Liu <piliu@redhat.com>
        Acked-by: Kairui Song <kasong@redhat.com>
    
    Signed-off-by: Coiby Xu <coxu@redhat.com>