efi: Add GRUB_PE32_MAGIC definition
Add a generic GRUB_PE32_MAGIC definition for the PE 'MZ' tag and delete
the existing one in arm64/linux.h.
Update arm64 Linux loader to use this new definition.
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Origin: upstream, https://git.savannah.gnu.org/cgit/grub.git/commit/?id=
c5841ba7f0d14c193f20854e7e55b4f7ce9207d5
Bug-Debian: https://bugs.debian.org/907596
Bug-Debian: https://bugs.debian.org/909420
Last-Update: 2018-12-06
Patch-Name: efi-add-GRUB_PE32_MAGIC-definition.patch