Back out "Add _int_mm to expose cuBLAS int8@int8 -> int32 matmul (#94339)" (#96885)
Summary:
Backing out _int_mm to expose cuBLAS int8@int8 -> int32 matmul (#94339)
Test Plan: CI
Pull Request resolved: https://github.com/pytorch/pytorch/pull/96885
Approved by: https://github.com/drisspg