[CK][CK Tile] Conv Bwd Data flush cache and profiling improvements (#6090)

## Motivation

Improve accuracy of conv bwd data perf measurements

## Technical Details
- enable flush cache
- for grouped conv we zero conv input(gemm output) inside device op, so
we also include this in time measurement
- for non-grouped conv we zero conv input(gemm output) outside device op
(in profile_conv_bwd_data_impl.hpp) so it is not included.
- In this pr I changed it to include zeroing if time_kernel/flush cache
is enabled so at now you should have more fair comparison. I changed it
only for time_kernel/flush_cache because MIOpen run own zeroing for
non-grouped solvers.

## Test Plan

test_grouped_conv_bwd_data_*

## Test Result

CI pending

## Submission Checklist

- [x] Look over the contributing guidelines at
https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

profiler/src/profile_grouped_conv_bwd_data_tile.cpp

@@ -89,7 +89,8 @@ int call_profiler(const ckt::Args<SIGNATURE>& args,
                                    0 /*log_level*/,
                                    5 /*cold_iters*/,
                                    50 /*nrepeat_*/,
-                                   true /*is_gpu_timer_*/});
+                                   true /*is_gpu_timer_*/,
+                                   time_kernel /*flush_cache*/});
     if(time_kernel)
     {
         std::cout << "\nBest configuration parameters:" << "\n\tname: " << op_name << " (instance "