xen: Prepare common code for Xen PVH support

xen: Prepare common code for Xen PVH support

Some common code needs to be special cased for Xen PVH mode. This hits
mostly Xen PV mode specific areas.

Split include/grub/i386/pc/int_types.h off from
include/grub/i386/pc/int.h to support including this file later from
xen_pvh code without the grub_bios_interrupt definition.

Move definition of struct grub_e820_mmap_entry from
grub-core/mmap/i386/pc/mmap.c to include/grub/i386/memory.h in order
to make it usable from xen_pvh code.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Tested-by: Hans van Kranenburg <hans@knorrie.org>
Origin: upstream, https://git.savannah.gnu.org/cgit/grub.git/commit/?id=fc9d47ead56365c3335bb42cf651008c9ac1f494
Bug-Debian: https://bugs.debian.org/776450
Last-Update: 2019-01-07

Patch-Name: xen-pvh-prepare-common-code.patch

Gbp-Pq: Name xen-pvh-prepare-common-code.patch