## Motivation
Build pipelines with seqlen padding only to support vectorized loads in
the hdim dimension.
The existing pipelines have either all dims padded or all dims not
padded.
These pipelines can be used in ComfyUI for slightly better performance.
## Technical Details
Also a fix included for correct FLOPS calculation in
`tile_example_fmha_fwd` when `seqlen_q * seqlen_k` overflows index_t
capacity (signed int32).
## Test Plan
The existing test cases will use the new pipelines when parameters allow
(seqlens - padded, hdims - not padded):
```
ninja test_ck_tile_fmha_fwd
bin/test_ck_tile_fmha_fwd_fp16
bin/test_ck_tile_fmha_fwd_bf16
bin/test_ck_tile_fmha_fwd_fp8bf16 # for gfx12
```
## Test Result
All tests must pass.
## Submission Checklist
- [x] Look over the contributing guidelines at
https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.
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