x86: remove bootloader upgrade from preinit

This hack was to bring all existing installations to the newest GRUB
version as fast as possible. Since 19.07.x is EoL we can assume this
task is completed. Now sysupgrade will solely be responsible for
bootloader upgrade.

Signed-off-by: Tomasz Maciej Nowak <tmn505@gmail.com>

target/linux/x86/base-files/lib/preinit/81_upgrade_bootloader

@@ -1,18 +0,0 @@
-upgrade_bootloader() {
-	local diskdev
-
-	. /lib/upgrade/common.sh
-
-	if [ ! -f /boot/grub/upgraded ] && export_bootdevice && export_partdevice diskdev 0; then
-		part_magic_efi "/dev/$diskdev" && return 0
-		echo "(hd0) /dev/$diskdev" > /tmp/device.map
-		/usr/sbin/grub-bios-setup \
-			-m "/tmp/device.map" \
-			-d "/boot/grub" \
-			-r "hd0,msdos1" \
-			"/dev/$diskdev" \
-		&& touch /boot/grub/upgraded
-	fi
-}
-
-[ "$INITRAMFS" = "1" ] || boot_hook_add preinit_main upgrade_bootloader

target/linux/x86/base-files/lib/upgrade/platform.sh

@@ -62,8 +62,7 @@ platform_do_bootloader_upgrade() {
 			-m "/tmp/device.map" \
 			-d "/tmp/boot/boot/grub" \
 			-r "hd0,${parttable}1" \
-			"/dev/$diskdev" \
-		&& touch /tmp/boot/boot/grub/upgraded
+			"/dev/$diskdev"
 
 		umount /tmp/boot
 	fi