radv: wait on the high 32 bits of timestamp queries

In case we are unlucky if the low part is 0xffffffff.

Fixes: 5d6a560a ("radv: do not use the availability bit for timestamp queries")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
(cherry picked from commit c7ada490)
[Emil: resolve trivial conflicts]
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>

Conflicts:
	src/amd/vulkan/radv_query.c