Replace _baddbmm_mkl_ with cpublas::gemm_batched (#66165)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/66165
Test Plan: Imported from OSS
Reviewed By: dagitses
Differential Revision: D31493952
Pulled By: ngimel
fbshipit-source-id: 87cf79036c2d0f4955edbeeeb78f578b0fd223ab
