rocr/xdna-driver: Initial support for amdxdna driver

Change-Id: I319b55d89dc644e7151228cb6c19d1a633171295

runtime/hsa-runtime/core/runtime/runtime.cpp

@@ -244,6 +244,11 @@ void Runtime::RegisterAgent(Agent* agent, bool Enabled) {
   }
 }
 
+// Register driver.
+void Runtime::RegisterDriver(std::unique_ptr<Driver> &driver) {
+  agent_drivers_.push_back(std::move(driver));
+}
+
 void Runtime::DestroyAgents() {
   agents_by_node_.clear();
 
@@ -267,6 +272,14 @@ void Runtime::DestroyAgents() {
   system_regions_coarse_.clear();
 }
 
+void Runtime::DestroyDrivers() {
+  for (auto &d : agent_drivers_) {
+    d->Close();
+  }
+
+  agent_drivers_.clear();
+}
+
 void Runtime::SetLinkCount(size_t num_nodes) {
   num_nodes_ = num_nodes;
   link_matrix_.resize(num_nodes * num_nodes);
@@ -2062,6 +2075,8 @@ void Runtime::Unload() {
 
   CloseTools();
 
+  DestroyDrivers();
+
   AMD::Unload();
 }