support selected_rows kernel for multiply in dygraph (#45217)

paddle/phi/api/yaml/legacy_api.yaml

@@ -1860,7 +1860,8 @@
   infer_meta :
     func : ElementwiseInferMeta
   kernel :
-    func : multiply
+    func : multiply {dense, dense -> dense},
+           multiply_sr {selected_rows, dense -> selected_rows}
   backward : multiply_grad
 
 - api : nearest_interp

python/paddle/fluid/clip.py

@@ -555,7 +555,7 @@ class ClipGradByGlobalNorm(ClipGradBase):
             if need_clip:
                 clip_input = (clip_var.astype('float16') if g.dtype
                               == core.VarDesc.VarType.FP16 else clip_var)
-                new_grad = _C_ops.elementwise_mul(g, clip_input)
+                new_grad = layers.elementwise_mul(g, clip_input)
                 params_and_grads.append((p, new_grad))
             else:
                 params_and_grads.append((p, g))