In the case that the image should support booting via EFI *and*
legacy grub, i.e. hybrid booting, the canonical grub config is
stored in /boot/grub2 just as for normal legacy booting. The
config file for efi grub is a very small one that will just look
for the partition containing the /boot/grub2/grub.cfg file and use
then set the prefix accordingly and load that file. In the hybrid
case grubenv file also will just be located in /boot/grub2 and
not in the ESP therefore the symlink that was created by the
package needs to be removed.
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