[inductor][easy] Enable mypy checking for all inductor files that already pass (#109238)
Summary: Let's just enable if mypy checking already passes. I checked all entries in the exclude list and enabled any that individually pass. Also needed one trivial change to a file already enabled.
Test Plan: `lintrunner torch/_inductor/*.py torch/_inductor/*/*.py`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/109238
Approved by: https://github.com/eellison
