SWDEV-278896 - Increase thresholds to match MT behavior

MT doesn't use GPU waits, but CPU for sync between engines.
Change the threshold values for CPU waits for direct dispatch.
That will bring behavior closer to MT.

Change-Id: Ia41c3cb812614962aff2746b6cf858f1bf77dda2

rocclr/device/rocm/rocvirtual.cpp

@@ -394,8 +394,8 @@ hsa_signal_t* VirtualGPU::HwQueueTracker::WaitingSignal(HwQueueEngine engine) {
     // Early signal status check
     if (hsa_signal_load_relaxed(prof_signal->signal_) > 0) {
       const Settings& settings = gpu_.dev().settings();
-      // Actively wait on CPU for 50 us to avoid extra overheads of signal tracking on GPU
-      if (!WaitForSignal<kTimeout50us>(prof_signal->signal_)) {
+      // Actively wait on CPU for 750 us to avoid extra overheads of signal tracking on GPU
+      if (!WaitForSignal<kTimeout750us>(prof_signal->signal_)) {
         if (settings.cpu_wait_for_signal_) {
           // Wait on CPU for completion if requested
           CpuWaitForSignal(prof_signal);