Fix the ut of matmulv2 for broadcast case (#29461)

* fix the ut of matmulv2 for broadcast

python/paddle/fluid/tests/unittests/test_matmul_v2_op.py

@@ -244,8 +244,8 @@ class TestMatMuklOp14(TestMatMulV2Op):
     """
 
     def config(self):
-        self.x_shape = (3, 1, 1, 10, 10)
-        self.y_shape = (1, 2, 2, 10, 10)
+        self.x_shape = (3, 1, 6, 6)
+        self.y_shape = (1, 2, 6, 9)
         self.trans_x = True
         self.trans_y = False
 
@@ -256,8 +256,8 @@ class TestMatMuklOp15(TestMatMulV2Op):
     """
 
     def config(self):
-        self.x_shape = (3, 1, 1, 10, 10)
-        self.y_shape = (1, 2, 2, 10, 10)
+        self.x_shape = (3, 1, 6, 6)
+        self.y_shape = (1, 2, 6, 9)
         self.trans_x = False
         self.trans_y = False