SWDEV-332512 - Add ROC_SIGNAL_POOL_SIZE

Default value is 32 HSA signals in the pool.

Change-Id: Icb69413d3ff6ef228d9a9e22fd024e72c6d8ebe4

rocclr/device/rocm/rocvirtual.cpp

@@ -330,7 +330,7 @@ VirtualGPU::HwQueueTracker::~HwQueueTracker() {
 
 // ================================================================================================
 bool VirtualGPU::HwQueueTracker::Create() {
-  constexpr size_t kSignalListSize = 32;
+  uint kSignalListSize = ROC_SIGNAL_POOL_SIZE;
   signal_list_.resize(kSignalListSize);
 
   hsa_agent_t agent = gpu_.gpu_device();