Recommended update for grub2

This update for grub2 fixes the following issues:

- Fix a regression introduced by the previous update which could prevent
booting on ppc64. (bsc#1134287, bsc#1139345).

This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
bnc#1139345
SLES 12 SP4 / SLES 15 SP1 - STC910.20:zzfpitc2: SLES12 SP4/SLES15 SP1 LPAR took almost 30 minutes to boot to Linux login prompt when FC adapter (sailfish) present (grub2)
bnc#1134287
L3: grub2 hungs with "Welcome to GRUB!" message without further response
Selected Binaries
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