[Test] re-enable bias export test cases after Brevitas fix

tests/brevitas/test_brevitas_QConv2d.py

@@ -50,8 +50,6 @@ export_onnx_path = "test_brevitas_conv.onnx"
 @pytest.mark.parametrize("bias", [True, False])
 @pytest.mark.parametrize("in_channels", [32])
 def test_brevitas_QConv2d(dw, bias, in_channels):
-    if bias:
-        pytest.xfail("bias export bug")
     ishape = (1, 32, 111, 111)
     if dw is True:
         groups = in_channels

tests/brevitas/test_brevitas_qlinear.py

@@ -48,8 +48,6 @@ export_onnx_path = "test_brevitas_qlinear.onnx"
 @pytest.mark.parametrize("w_bits", [4])
 @pytest.mark.parametrize("i_dtype", [DataType.UINT4])
 def test_brevitas_qlinear(bias, out_features, in_features, w_bits, i_dtype):
-    if bias:
-        pytest.xfail("bias export bug")
     i_shape = (1, in_features)
     w_shape = (out_features, in_features)
     b_linear = QuantLinear(