Apply debranding changes

Fix boot failures in ppc64le caused by storage race condition (diegodo)

Fix bug of grub2-install not checking for the SBAT option
2020-14372
2020-25632
2020-25647
2020-27749
2020-27779
2021-20225
2021-20233

Fix another batch of CVEs
2020-14372
2020-25632
2020-25647
2020-27749
2020-27779
2021-20225
2021-20233

Fix keylayouts module listed twice in GRUB_MODULES variable

Fix "Add 'at_keyboard_fallback_set' var to force the set manually"
Fix a boot failure due patch "ieee1275: claim up to 256MB memory"

Add appended signatures support for ppc64le LPAR Secure Boot (daxtens)

Add 'at_keyboard_fallback_set' var to force the set manually
Related: rhbz#1897587

add keylayouts and at_keyboard modules to UEFI Grub2 (rmetrich)
at_keyboard: use set 1 when keyboard is in Translate mode (rmetrich)
add GRUB enhanced debugging features (rmetrich)
ieee1275: Avoiding many unecessary open/close (diegodo)
ieee1275: device mapper and fibre channel discovery support (diegodo)

grub2-install: disable support for EFI platforms
Include a few more modules to EFI build needed for LUKS support (javierm)

Fix tps-rpmtest failing due /boot/grub2/grubenv attributes mismatch
Include in EFI build the modules needed for LUKS support
Fix keyboards that report IBM PC AT scan codes

Roll over TFTP block counter to prevent timeouts with data packets

Fix TFTP timeouts when trying to fetch files larger than 65535 KiB

Fix a legacy BIOS boot issue when a using config file shared with EFI

Couple more late fixes.
2020-15705

Couple more late fixes.
2020-10713
2020-14308
2020-14309
2020-14310
2020-14311