grub2 security update

[2.02-81.0.4]

• Fix CVE-2020-10713, CVE-2020-14308, CVE-2020-14309, CVE-2020-14310, CVE-2020-14311,
  CVE-2020-15705, CVE-2020-15706, CVE-2020-15707 [Orabug: 31225072]
• Update signing certificate for efi binaries
  [2.02-0.81.0.2]
• Enable common subpackage build for aarch64
• Disable RHEL patch 0183-efinet-retransmit-if-our-device-is-busy.patch to comply with UEFI spec
• increase timeout to 10ms in efinet.c, [Orabug: 27982684]
  [2.02-0.81.0.1]
• Update upstream references [Orabug: 30138841]
• build with the updated Oracle certificate
• Restore symlink to grub environment file, that was removed during grub2-efi update
  if grub2 package is also installed on UEFI machines [Orabug: 27345750]
• fix symlink removal scriptlet, to be executed only on removal [Orabug: 19231481]
• Pack files in efidir with disabled rpm verification [Orabug: 27166026]
• Fix comparison in patch for [Orabug: 18504756]
• Remove symlink to grub environment file during uninstall on EFI platforms [Orabug: 19231481]
• replace dynamic EFI boot folder path generation with predefined ‘redhat’ (Alex Burmashev)
• update Oracle Linux certificates (Alexey Petrenko)
• Put ‘with’ in menuentry instead of ‘using’ [Orabug: 18504756]
• Use different titles for UEK and RHCK kernels [Orabug: 18504756]
• changed efidir with 0700 access rights, redhat chose another approach in rhbz#1496952, [Orabug: 28622344]
• revert orabug [Orabug: 27166026] changes