drop redundant includes for ck_gemm folders in setup.py

[Rohan138]

Motivation

https://github.com/ROCm/aiter/pull/830/files/b79c6d3eeaf4588ad495a5c48b0d35ef9ec3ed58 explicitly copies the headers from the ck gemm include folders e.g. aiter/csrc/ck_batched_gemm_a8w8/include into {prebuild_dir}/include.

However, #1159 added the corresponding include directories for each module into the extra_include field in optCompilerConfig.json, so we don't actually need the redundant copy; the folders are already included in the final build as part of prebuild_link_param["extras_include"] here.

Mildly relevant copilot comment: #1423 (comment)

Technical Details

Test Plan

Test Result

Submission Checklist

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