Fix device discoverability on PowerVM when the prefix is not set (dja)

Discover the device to read the config from as a fallback

20-grub-install: Create a symvers.gz symbolic link

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

Build and sign powerpc-ieee1275 images

Find and claim more memory for ieee1275 (dja)

Sync with the latest content of the rhel-8.4.0 branch

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