ARMv7 will now support UEFI and grub2-efi so add those deps. We also don't
require uboot-tools as part of the install process so don't add that
explicitly, and drop grubby from the aarch64 explicit list as it's in the
general list, add grub2-tools-efi.
Signed-off-by: Peter Robinson <pbrobinson@gmail.com>