aa9b1b4 Drop installkernel so that it can by provided by systemd

Authored and Committed by zbyszek 8 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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