Add support to generate UKI images from kernel updates, and install them into GRUB.
Usage:
make prepare && make install
The binary linuxriscv64.efi.stub.noinitrd is a customized systemd EFI stub so that:
- Does not contain an initrd
- It accepts more PE sections than the default, as ukify will add one .dtbauto PE section per device-tree in the system.