radv: add missing u_atomic.h include

Fixes: 7568c97df14f8702efcc ("radv: Use atomics to read query results.")
Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7050>
diff --git a/src/amd/vulkan/radv_query.c b/src/amd/vulkan/radv_query.c
index ccff1f7..d49bc0f 100644
--- a/src/amd/vulkan/radv_query.c
+++ b/src/amd/vulkan/radv_query.c
@@ -34,6 +34,7 @@
 #include "radv_private.h"
 #include "radv_cs.h"
 #include "sid.h"
+#include "util/u_atomic.h"
 
 #define TIMESTAMP_NOT_READY UINT64_MAX