Remove all tritonbench code
Summary:
Tritonbench code is moved to pytorch-labs/tritonbench.
We can remove the tritonbench code from pytorch/benchmark.
Reviewed By: malfet, huydhn, kit1980
Differential Revision: D65548525
fbshipit-source-id: 625490a0fc4b060f64898357407a4e46643d3936
