add BFloat16 support for AdaptiveMaxPool2d on CPU (#66929)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/66929
Test Plan: Imported from OSS
Reviewed By: mikaylagawarecki
Differential Revision: D33353199
Pulled By: VitalyFedyunin
fbshipit-source-id: d402d5deb7ca766259ca42118ddc16625e134c4c
