* delete useless code to avoid fp8e4m3 benchmark error

To solve the bug:

```shell
Traceback (most recent call last):
  File "/home/xingzai/mamf-finder.py", line 353, in <module>
    _ = benchmark_mm(m[0], n[0], k[0], dtype, device, args.num_iterations, args.num_warmup_iterations)
  File "/home/xingzai/mamf-finder.py", line 255, in benchmark_mm
    times = time_iterations()[num_warmup_iterations:]
  File "/home/xingzai/mamf-finder.py", line 216, in func_wrapper
    C.copy_(C_rand)  # re-randomize the target matrix
AttributeError: 'tuple' object has no attribute 'copy_'
```

* Update mamf-finder.py

* Update mamf-finder.py

* upd

* Update mamf-finder.py

* - support fp8 on amd
- simplify version check
- remove hardcoded dtype

---------

Co-authored-by: Stas Bekman <stas@stason.org>