On RHEL-8, the x86_64 AMI / EC2 images used a BIOS-only partition table
layout, because the base partition table unification happened in the
past only on RHEL-9 and Fedora (inherited from RHEL-9).
To make things consistent and uniform across RHEL-8 and RHEL-9, I copied
the base partition table used by RHEL-9 AMI / EC2 images to RHEL-8. This
has a side-effect for aarch64 AMI / EC2, where the `/boot` partition
size changed from 512 MiB to 500 MiB, together with the partition GUID
to "Extended Boot Loader Partition GUID".
Signed-off-by: Tomáš Hozza <thozza@redhat.com>
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