Add patch to install kernel images for GRUB BootLoaderSpec support
    
    GRUB now has BootLoaderSpec support, the user can choose to use this by
    setting GRUB_ENABLE_BLSCFG to true in /etc/default/grub. On this setup,
    grubby isn't used to generate the kernel modules dependencies, instead
    the depmod install script could be used.
    
    But the BLS support in GRUB uses the config snippets that are generated
    at build time and included in the kernel package, so the loaderentry
    install script shouldn't be executed when using GRUB.
    
    Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>