ref-manual: split CentOS-7 and CentOS-8 reqs

CentOS-7 has different requirements than the much
newer CentOS-8. Add a section for CentOS-8 and
make the old section CentOS-7 specific.

NOTE: at the time this was written, the 'fop'
package is not yet available in epel-8. As
a Fedora packager, that will change.

(From yocto-docs rev: caf08811a23a29965ec915459019796a0c882d4d)

Signed-off-by: Tim Orling <timothy.t.orling@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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