!11358 Set instancenorm internel interface

From: @yuan_shen_zhou
Reviewed-by: @liangchenghui,@c_34
Signed-off-by: @liangchenghui

mindspore/ops/operations/__init__.py

@@ -130,7 +130,6 @@ __all__ = [
     'MaxPoolWithArgmax',
     'FusedBatchNorm',
     'FusedBatchNormEx',
-    'InstanceNorm',
     'BNTrainingReduce',
     'BNTrainingUpdate',
     'BatchNorm',