also add the config help from benh tree
and allow building both drivers as modules

the proper way would be 
to mv drivers/video/radeonfb.c to  drivers/video/radeonfb_old.c
but to keep the patch clearer (and smaller) i just added
drivers/video/radeonfb_old.c conaining single line
#include "radeonfb.c"

svetljo

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