ONNX files for Opset 8 fp16_tiny_yolov gets errors

[mvermeulen]

Running this ONNX file with the MIGraphX driver results in the following errors

terminate called after throwing an instance of 'migraphx::version_1::exception'
  what():  /home/mev/source/AMDMIGraphX/src/include/migraphx/check_shapes.hpp:84
: Types do not match

Not 100% certain these are the same model, but fp32 Opset 8 version of tiny_yolov2 works without error. I've attached a dump of ONNX files for both fp16 and fp32 models yolov_fp32.txt yolov_fp16.txt

[mvermeulen]

Note: Both the fp32 and fp16 versions are created from WinMLTools. These are the only models in the test set that come from this provider.

[scxiao]

migraphx considers all attribute as float type, but input of the model is fp16, so there is a typemismatch.

[scxiao]

created a PR for the fix

[mvermeulen]

Implemented