[Fix] fix coreml for branch 1.x

[grimoire]

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[Jaykob]

This is very promising! :-)
Can you give us an example how you would call it for a mmdet model to CoreML?

[grimoire]

@Jaykob

python tools/deploy.py \
             ${MMDEPLOY_PATH}/configs/mmdet/detection/detection_coreml_static-800x1344.py \
             ${MMDET_PATH}/configs/retinanet/retinanet_r50_fpn_1x_coco.py \
             ${TORCH_CHECKPOINT_PATH}/mmdetection/retinanet_r50_fpn_1x_coco_20200130-c2398f9e.pth \
             ${MMDET_PATH}/demo/demo.jpg

would give you a coreml model.
And you can call it with mmdeploy.backend.coreml.CoreMLWrapper, just like a torch model.

[lvhan028]

Is there any related issue to this PR?

[grimoire]

@lvhan028 #1658 same fix for branch 1.x