Security update for grub2

This update for grub2 fixes the following issues:

- CVE-2020-15705: Fail kernel validation without shim protocol (bsc#1174421).
- Add fibre channel device's ofpath support to grub-ofpathname and search hint to speed up root device discovery (bsc#1172745).

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Fixed bugs
bnc#1172745
L3: SLES 12 SP4 - Slow boot of system after updated kernel - takes 45 minutes after grub to start loading kernel ()
bnc#1174421
VUL-0: CVE-2020-15705: grub2: linuxefi: fail kernel validation without shim protocol.
Selected Binaries
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