Current KIWI cannot support UEFI on aarch64, backport upstream
patch to re-work bootloader installation code to support UEFI
on ARM64 platform.
References: bsn#392
Signed-off-by: Chenxi Mao <chenxi.mao@suse.com>
(cherry picked from commit 0d03e05f4c33a0ccde304578a0dafa140bcc9d4f)