[CK][CK Tile] Grouped Convolution backward weight profiler flush cache (#5454)
## Motivation
Flush cache to get more stable results during profiling old ck and ck
tile.
## Technical Details
Flush cache before each kernel call and one more first run.
## Test Plan
test_grouped_conv_bwd_weight_tile
## Test Result
pass
## Submission Checklist
- [x] Look over the contributing guidelines at
https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.
AICK-966
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