Recommended update for grub2

This update for grub2 fixes the following issues:

- Fixed possible install media boot issues on certain hardware
by changing default tsc calibration method to pmtimer on EFI. (bsc#1114754)

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

Fixed bugs
bnc#1114754
Can't boot with any Bootables (Tumbleweed Live CD, Tumbleweed/Leap/SLE installers)
Selected Binaries
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