panfrost: Use DBG macro to avoid noise in the console

It pollutes the output of programs that use Panfrost and can confuse its
callers, such as test runners.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3625>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3625>
diff --git a/src/gallium/drivers/panfrost/pan_context.c b/src/gallium/drivers/panfrost/pan_context.c
index a3d95a3..c32254a 100644
--- a/src/gallium/drivers/panfrost/pan_context.c
+++ b/src/gallium/drivers/panfrost/pan_context.c
@@ -2506,7 +2506,7 @@
                 break;
 
         default:
-                fprintf(stderr, "Skipping query %u\n", query->type);
+                DBG("Skipping query %u\n", query->type);
                 break;
         }