ppc64le: replace kernel cmdline maxcpu=1 with nr_cpus=1
    
    Resolves: https://issues.redhat.com/browse/RHEL-43581
    Upstream: Fedora
    Conflict: Applied by manual
    
    commit 44a1b7da908a52c15a2b7ed286b59cfe7319b4c9
    Author: Sourabh Jain <sourabhjain@linux.ibm.com>
    Date:   Wed Feb 28 22:51:15 2024 +0530
    
        ppc64le: replace kernel cmdline maxcpu=1 with nr_cpus=1
    
        With patch series [1], PowerPC supports nr_cpus=1,
        so use nr_cpus=1 instead of maxcpu=1 in the kdump environment.
    
        Note this changes is dependent on kernel changes [1]
    
        [1] https://lore.kernel.org/all/170800202447.601034.7290612623478478380.b4-ty@ellerman.id.au/#t
    
        Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
        Cc: Hari Bathini <hbathini@linux.ibm.com>
        Cc: Mahesh Salgaonkar <mahesh@linux.ibm.com>
        Acked-by: Pingfan Liu <piliu@redhat.com>
    
    Signed-off-by: Pingfan Liu <piliu@redhat.com>