Recommended update for grub2

This update for grub2 fixes the following issues:

- Fix multi-device root= kernel argument (bsc#960776)
- Add SUSE_REMOVE_LINUX_ROOT_PARAM configuration option to /etc/default/grub (bsc#962585)
- Fix handling of --list argument in grub2-once (bsc#980088)
- Skip comments in /etc/sysconfig/bootloader (bsc#963610)
- Examine variables from grub environment in 'grub2-once' (fate#319632)
- Extend config-file parsing in 'grub2-once' (fate#319632)
- Add support for "t" hotkey to switch to text mode (bsc#976836)
- Fix default entry boot (bsc#977590)
- Fix PXE booting on ARM64 boards (bsc#990086)
- Use CPU timer for timekeeping on aarch64 (bsc#990604)

This update was imported from the SUSE:SLE-12-SP1:Update update project.

Fixed bugs
bnc#990086
PXE boot grub2-efi-arm64 fails on ThunderX BGX 40GBit
bnc#990604
rpi3: GRUB2 clock too slow
bnc#960776
Guest unable to boot if rootfs is on btrfs and spans multiple disks
bnc#962585
L3-Question: zIPL and Grub2 configuration files and root= parameter
bnc#963610
systemd-sleep-grub may fail to call grub2-once because of comments in /etc/sysconfig/bootloader
bnc#976836
grub2: Allow users to switch to text console
bnc#977590
[Build 1451][ppc64] grub2 default entry should be set on local, but is set on installation
bnc#980088
grub2-once --list bug
Selected Binaries
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