Reduce gate capacity further for NAVI3 cards (#277)

[ROCm/rocprofiler-sdk commit: b19b4eddc7]

projects/rocprofiler-sdk/source/lib/rocprofiler-sdk/hsa/queue.cpp

@@ -71,7 +71,7 @@ signal_limiter()
 {
     // Limit the maximun number of HSA signals created.
     // There is a hard limit to the maximum that can exist.
-    static common::active_capacity_gate _gate(16);
+    static common::active_capacity_gate _gate(4);
     return _gate;
 }