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>