ci: run radv-fossils with Pitcairn (GFX6) and Bonaire (GFX7) too

This job is really small and it shouldn't hurt to cover two more
generations. This will prevent breaking the world on GFX6-GFX7
because we don't regularly test these chips.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Acked-by: Michel Dänzer <mdaenzer@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4873>
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