- fixed wrong filesystem label for the efi jump partition.
  According to the EFI spec it should be EFI not BOOT

- fixed the boot partition setup in case of an EFI system.
  kiwi checks the filesystem type of the jump partition
  and not the boot partition which leads to a missing
  boot -> . link on the boot partition which then prevents
  the grub2 efi core image to find the grub.cfg file