Update supported dtypes of truncatediv Op in gpu_supported_ops.md
Hi @cheshire Can you please review this PR ? Thank you!
Updated supported `dtypes` of `truncatediv` Op which is missing the list. 

From:
`{complex64,double,float,int32,int64}
`

To:
`{complex64,complex128,double,float,half,bfloat16,int8,int16,int32,int64,uint8,uint16,uint32,uint64}
`

as this Op also supports mentioned dtypes.

May please refer attached [gist](https://colab.sandbox.google.com/gist/SuryanarayanaY/b0e584a4d45599bbff914d4119640d8e/tf-truncatediv_with_jit.ipynb).