Revert "Add Flash Attention support on ROCM (#121561)"
This reverts commit a37e22de7059d06b75e4602f0568c3154076718a.
Reverted https://github.com/pytorch/pytorch/pull/121561 on behalf of https://github.com/huydhn due to Sorry for reverting your change but this needs more work to be able to land in fbcode because https://github.com/ROCm/aotriton is not available there atm. We are working to reland this change before 2.3 release ([comment](https://github.com/pytorch/pytorch/pull/121561#issuecomment-2007717091))
