radv: advertise attachmentFragmentShadingRate on GFX10.3

Layered VRS attachments is for later.
The CTS failures are similar to the existing ones, I will investigate
soon.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <!10187>
39 jobs for !10187 with radv_attachment_vrs in 15 minutes and 22 seconds (queued for 3 seconds)
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