[NFC][ELF] Replace DynamicReloc::Kind with the equivalent bool in APIs
DynamicReloc::AgainstSymbol is now true and DynamicReloc::AddendOnly is
now false; uses of the constants were replaced mechanically.
Reviewers: rnk, MaskRay
Reviewed By: MaskRay
Pull Request: https://github.com/llvm/llvm-project/pull/150813