wsl/hsakmt: drop doorbell signal

For wsl, doorbell ring needs to call hsaKmtQueueRingDoorbell
instead of atomic store in hsa runtime. It does not care about
the doorbell signal value. So just return a pointer that points
a memory allocation of 8 bytes.

Signed-off-by: Longlong Yao <Longlong.Yao@amd.com>
Reviewed-by: lyndonli <Lyndon.Li@amd.com>
Part-of: <http://10.67.69.192/wsl/libhsakmt/-/merge_requests/14>

inc/wddm/queue.h

@@ -171,7 +171,7 @@ public:
   }
 
   hsa_status_t Process(void);
-  uint64_t * GetDoorbellPtr() const { return (uint64_t *)&doorbell_signal_.value; }
+  uint64_t * GetDoorbellPtr() const { return (uint64_t *)&doorbell_signal_value_; }
   void RingDoorbell();
 private:
   hsa_status_t KernelDispatchAqlToPm4(char *cpu, hsa_kernel_dispatch_packet_t *packet);
@@ -235,7 +235,7 @@ private:
   GpuMemoryHandle amd_queue_mem_;
   amd_queue_t *amd_queue_;
   amd_queue_t *amd_queue_rocr_;
-  amd_signal_t doorbell_signal_;
+  uint64_t doorbell_signal_value_;
   volatile std::atomic<int64_t> *error_code_;
   std::thread aql_to_pm4_thread_;
   bool thread_stop_;