[MIGraphX EP Support]Remove default noopt for Migraphx EP in Benchmark.py (#21843)
…ripts (#58)
### Description
<!-- Describe your changes. -->
Removes the heavy handed no opt for all MIGraphX using the benchmark.py
scripts
### Motivation and Context
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- If it fixes an open issue, please link to the issue here. -->
Finding this hurts performance if we remove all optimizations. Let the
fine tuning occur at the script level instead of a blanket NoOPT being
selected
Co-authored-by: Ted Themistokleous <tedthemistokleous@amd.com>