Fix various lint warnings under runtime/executor/... (#1589)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/1589

Fix a bunch of clang-tidy warnings hit when building .cpp/.h files under runtime/executor/..., which can also include .h files included by those .cpp files.

Reviewed By: larryliu0820

Differential Revision: D52717684

fbshipit-source-id: c882a9ac72981d364a9e58c24b1fc0ec19740c03