Add constructor for fused dropout param to ease use. (#38475)

paddle/fluid/operators/fused/fused_dropout_helper.h

@@ -51,6 +51,18 @@ struct DropoutParam {
     seed_val = 0;
   }
 
+  DropoutParam(bool fix_seed_, uint64_t seed_, bool is_test_,
+               bool is_upscale_in_train_, float dropout_prob_,
+               const framework::Tensor* tensor_seed_, int seed_val_) {
+    fix_seed = fix_seed_;
+    seed = seed_;
+    is_test = is_test_;
+    is_upscale_in_train = is_upscale_in_train_;
+    dropout_prob = dropout_prob_;
+    tensor_seed = tensor_seed_;
+    seed_val = seed_val_;
+  }
+
   /**
    * dropout_index: can be 0, 1, 2. 0 means there is only one dropout,
    * 1 and 2 represent two dropout, the parameter name of dropout