radv/gfx9: fix set predication packet.
The predication packet changed format on GFX9, update the driver. Reviewed-by:Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> Cc: "17.2" <mesa-stable@lists.freedesktop.org> Signed-off-by:
Dave Airlie <airlied@redhat.com> (cherry picked from commit 5247b311)