[lld] [lld] Add missing include in AArch64ErrataFix (NFC) (PR #190664)

[Peter Smith via llvm-commits]

https://github.com/smithp35 approved this pull request.

This looks good to me given the LLVM policy on header files should be self contained. https://llvm.org/docs/CodingStandards.html#self-contained-headers 

> Header files should be self-contained (compile on their own) and end in .h. Non-header files that are meant for inclusion should end in .inc and be used sparingly.

At the moment it looks like `InputFiles.cpp` includes `lld/ELF/config.h` which includes `SmallVector.h`.



https://github.com/llvm/llvm-project/pull/190664