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[ELF] Wrap things in `namespace lld { namespace elf {`, NFC

Description

[ELF] Wrap things in namespace lld { namespace elf {, NFC

This makes it clear ELF/**/*.cpp files define things in the lld::elf
namespace and simplifies elf::foo to foo.

Reviewed By: atanasyan, grimar, ruiu

Differential Revision: https://reviews.llvm.org/D68323