[ROCm] Enable BFloat16 for Gemm and MatMul Op (#10398)
* gemm-bf16
* gemm bf16
* gemm bf16
* matmul bf16
* minor style change
Co-authored-by: Ethan Tao <ettao@microsoft.com@orttrainingdev7.d32nl1ml4oruzj4qz3bqlggovf.px.internal.cloudapp.net>
Co-authored-by: root <root@GCRAMDRR1-MI100-087.redmond.corp.microsoft.com>
