powerpc: update kdumpctl to remove deletion of kernel signing key once loaded
    
    Resolves: https://issues.redhat.com/browse/RHEL-14003
    Upstream: Fedora
    Conflict: None
    
    commit fe6eb30e6756d3c13bb7485a08f066b18cd1594b
    Author: Nayna Jain <nayna@linux.ibm.com>
    Date:   Tue Oct 3 23:41:46 2023 -0400
    
        powerpc: update kdumpctl to remove deletion of kernel signing key once loaded
    
        Kernel signing key is deleted once kdump is loaded. This causes confusion in
        debugging since key is no longer visible. Unless someone knows how
        kdumpctl script works, it is difficult to find out how kdump could be
        loaded when there is no key on .ima keyring.
    
        Remove deletion of kernel signing key once loaded. And then to prevent
        multiple loading of same key when kdump service is disabled/enabled, update
        key description field as well.
    
        Suggested-by: Mimi Zohar <zohar@linux.ibm.com>
        Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
        Reviewed-by: Philipp Rudo <prudo@redhat.com>
    
    Signed-off-by: Coiby Xu <coxu@redhat.com>