Use the same bootloader pkg-map for all redhat family
Use the same bootloader pkg-map for all redhat family

The only difference between the rhel and redhat entries is rhel has
the extra grub-efi-x86_64 mapping. All redhat family releases would
benefit from having this too, so this change removes the whole rhel
entry and adds grub-efi-x86_64 to the redhat family.

The assumption is that anything which applies to rhel also applies to
centos-stream, and in this case doesn't harm centos or fedora either.

Change-Id: I0dc44c1f2b57516742f4c3e43cfc8874d6b90fa2

openstack/diskimage-builder,openstack/diskimage-builder