[remove xla from codegen] rename aten_xla_type.h -> DispatchKeyNativeFunctions.h (#58568)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/58568
I split out the file rename into a separate commit to make the diff easier. The template file name is `aten_xla_type.h` -> `{DispatchKey}NativeFunctions.h`
Test Plan: Imported from OSS
Reviewed By: pbelevich
Differential Revision: D28711298
Pulled By: bdhirsh
fbshipit-source-id: 2fa7d2abede560a2c577300f0b5a1f7de263d897
