Update MIGraphX Driver to change run timing and stream synchronization for runs

[TedThemistokleous]

Add additional flags to the MIGraphX Driver perf to allow for different timing methodologies to match how we run a model through onnxruntime.

Handling things this way allows us to do a correct apples to apples comparison between Onnxruntime MIGraphX Perf and MIGraphX Perf runs.

• [ ] Add flag alternative timing
• [ ] Flag for alternative sync/async modes
• [ ] Flag for alternative sync points (between run, at end of run)

cc @pfultz2 Incase I've missed anything or there's anything else you want to ad as part of this.