ppc64: Swap out FB_OF for OFDRM (boo#1193476)
    
     FB_OF=n
     AGP=n
     OFDRM=y
     DRM=y
    
     This disables support for the Apple UniNorth AGP bridge.
     yast does not support installing on Apple hardware anyway.
    
    Signed-off-by: Michal Suchanek <msuchanek@suse.de>