wsl/libhsakmt: add get_num_wddmdev()

Signed-off-by: Flora Cui <flora.cui@amd.com>
Reviewed-by: Tianci Yin <tianci.yin@amd.com>
Part-of: <http://10.67.69.192/wsl/rocr-runtime/-/merge_requests/82>

libhsakmt.h

@@ -36,6 +36,7 @@
 #include "impl/wddm/device.h"
 
 wsl::thunk::WDDMDevice* get_wddmdev(uint32_t node_id);
+uint32_t get_num_wddmdev();
 wsl::thunk::GpuMemory *get_gpu_mem(void *MemoryAddress);
 
 #define HSAKMT_DEBUG_LEVEL_ERR      -1

topology.cpp

@@ -1461,3 +1461,7 @@ wsl::thunk::WDDMDevice *get_wddmdev(uint32_t node_id) {
 
   return dxg_topology->wdevices_[node_id - 1];
 }
+
+uint32_t get_num_wddmdev() {
+  return dxg_topology->wdevices_.size();
+}