Move frame-buffer and drm renderers back to main package
    
    Turns out that if we put *both* in the graphics-libs subpackage
    minimal installs with 'rhgb' (which is what anaconda does out
    of the box) break. As @pbrobinson wasn't around to explain the
    rationale for moving the drm renderer to the subpackage in the
    first place, @halfline and I agreed to put both renderers back
    in the main package for now to avoid both that problem and
    bug #1518464 . We can revisit this after @halfline does some
    upstream code fixes.