Fix util/grub.d/20_linux_xen.in: Add xen_boot command support for aarch64

Commit d33045ce7f introduced
the support for this, but it does not work under x86 (as it stops
20_linux_xen from running).

The 20_linux_xen is run under a shell and any exits from within it:

(For example on x86):
+ /usr/bin/grub2-file --is-arm64-efi /boot/xen-4.9.0.gz
[root@tst063 grub]# echo $?
1

will result in 20_linux_xen exiting without continuing
and also causing grub2-mkconfig to stop processing.

As in:

 [root@tst063 grub]# ./grub-mkconfig | tail
 Generating grub configuration file ...
 Found linux image: /boot/vmlinuz-4.13.0-0.rc5.git1.1.fc27.x86_64
 Found initrd image: /boot/initramfs-4.13.0-0.rc5.git1.1.fc27.x86_64.img
 Found linux image: /boot/vmlinuz-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2
 Found initrd image: /boot/initramfs-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2.img
 		echo	'Loading Linux 0-rescue-ec082ee24aea41b9b16aca52a6d10cc2 ...'
 		linux	/vmlinuz-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2 root=/dev/mapper/fedora_tst063-root ro single
 		echo	'Loading initial ramdisk ...'
 		initrd	/initramfs-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2.img
 	}
 }

 ### END /usr/local/etc/grub.d/10_linux ###

 ### BEGIN /usr/local/etc/grub.d/20_linux_xen ###

 root@tst063 grub]#

And no more.

This patch wraps the invocation of grub-file to be a in subshell
and to process the return value in a conditional. That fixes
the issue.

RH-BZ 1486002: grub2-mkconfig does not work if xen.gz is installed.

CC: Fu Wei <fu.wei@linaro.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

util/grub.d/20_linux_xen.in

@@ -206,13 +206,12 @@ while [ "x${xen_list}" != "x" ] ; do
     if [ "x$is_top_level" != xtrue ]; then
 	echo "	submenu '$(gettext_printf "Xen hypervisor, version %s" "${xen_version}" | grub_quote)' \$menuentry_id_option 'xen-hypervisor-$xen_version-$boot_device_id' {"
     fi
-    $grub_file --is-arm64-efi $current_xen
-    if [ $? -ne 0 ]; then
-	xen_loader="multiboot"
-	module_loader="module"
-    else
+    if ($grub_file --is-arm64-efi $current_xen); then
 	xen_loader="xen_hypervisor"
 	module_loader="xen_module"
+    else
+	xen_loader="multiboot"
+	module_loader="module"
     fi
     while [ "x$list" != "x" ] ; do
 	linux=`version_find_latest $list`