makedumpfile: printk: use committed/finalized state values
    
    commit 44b073b7ec467aee0d7de381d455b8ace1199184
    Author: John Ogness <john.ogness@linutronix.de>
    Date:   Wed Nov 25 10:10:31 2020 +0106
    
        [PATCH 2/2] printk: use committed/finalized state values
    
        * Required for kernel 5.10
    
        The ringbuffer entries use 2 state values (committed and finalized)
        rather than a single flag to represent being available for reading.
        Copy the definitions and state lookup function directly from the
        kernel source and use the new states.
    
        Signed-off-by: John Ogness <john.ogness@linutronix.de>
    
    Signed-off-by: Kairui Song <kasong@redhat.com>