Remove also EFI version of BootLoader Specification dirs. This will:
- really force to re-generate initramfs during installation, after all
relevant configs are updated; previously, dracut (called by anaconda
through kernel-install) refuse to update already existing
/boot/efi/.../initrd file.
- save some precious space in /boot/efi
FixesQubesOS/qubes-issues#3234
(cherry picked from commit 53730c4ba2)