Revert "add Half support for BatchNorm on CPU (#102070)"
This reverts commit 6065e7a97cfad4c2ae2b8722969648a53265fa13.
Reverted https://github.com/pytorch/pytorch/pull/102070 on behalf of https://github.com/clee2000 due to sorry it looks like this is causing an unexpected success for `test_jit_fuser_te.py::TestNNCOpInfoCPU::test_nnc_correctness_nn_functional_batch_norm_cpu_float16` https://hud.pytorch.org/pytorch/pytorch/commit/6065e7a97cfad4c2ae2b8722969648a53265fa13 https://github.com/pytorch/pytorch/actions/runs/6178069462/job/16770849782 ([comment](https://github.com/pytorch/pytorch/pull/102070#issuecomment-1718402208))
