a3922c1 Drop installkernel so that it can by provided by systemd

Authored and Committed by zbyszek 11 months ago
    Drop installkernel so that it can by provided by systemd
    
    systemd has kernel-install which supports being invoked as installkernel.
    After the file is removed from grubby, we can just provide a symlink
    installkernel → kernel-install.
    
        
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