radv: additional query fixes

Make sure we read the updated data from the gpu in cases where WAIT_BIT
is not set.

Cc: 19.1 19.2 <mesa-stable@lists.freedesktop.org
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
(cherry picked from commit a410823b)