wsl/hsakmt: add lock for sdma packet processing

Suggested-by: Shane Xiao <shane.xiao@amd.com>
Signed-off-by: Flora Cui <flora.cui@amd.com>
Reviewed-by: Shane Xiao <shane.xiao@amd.com>
Reviewed-by: Shi.Leslie <Yuliang.Shi@amd.com>
Part-of: <http://10.67.69.192/wsl/libhsakmt/-/merge_requests/31>

inc/wddm/queue.h

@@ -285,6 +285,7 @@ private:
   uint64_t rptr_next;
   uint64_t doorbell_;
   std::queue<std::pair<uint64_t, uint64_t>> wptr_queue_;
+  std::mutex wptr_queue_lock_;
   uint64_t ib_size;
   uint64_t ib_start_addr;