[rocm-libraries] ROCm/rocm-libraries#8535 (commit a0f47eb)

[CK Tile] EightWaves pipeline int8 support

## Motivation

EightWaves pipeline currently is supporting only FP types

## Technical Details

 - Enable 16x16x64 int8 instruction for gfx950 in dispatcher
 - Enable int8 in EightWaves pipeline
 - Add tests
 - Fix bug in `warp_gemm_attribute_mfma_impl.hpp`

## Test Plan

Tests have been added for int8 GEMM using EightWaves pipeline

## Submission Checklist

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