SimpleProfiler not working on windows

[rohitgr7]

The SimpleProfiler durations are 0 on Windows

Examples:
https://github.com/PyTorchLightning/pytorch-lightning/blob/c5e1002fe4bc5f876d3f187999020ad8307e6051/tests/utilities/test_fetching.py#L492
https://github.com/PyTorchLightning/pytorch-lightning/blob/300fa1c31f51fd97c1257c7096df7a835c13d70f/tests/core/test_datamodules.py#L497

cc @carmocca @kaushikb11 @ninginthecloud @rohitgr7