Remove external links for RadeonSI/RADV

It is *very* bad to link to driver B in the "more information" of
driver A, especially because they're alternatives ...
2 jobs for master in 15 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #3105047
pages

00:00:15

 
  Deploy
passed pages:deploy

00:00:02