doc/README.SUSE: Update information about module paths
    (jsc#PED-5021)
    
    * Use version variables to describe names of the
      /lib/modules/$VERSION-$RELEASE-$FLAVOR/... directories
      instead of using specific example versions which get outdated quickly.
    * Note: Keep the /lib/modules/ prefix instead of using the new
      /usr/lib/modules/ location for now. The updated README is expected to
      be incorporated to various branches that are not yet usrmerged.