Revert "[RISCV] Support RISCV Atomics ABI attributes (#84597)"

This reverts commit 9221f3af.

As reported
<https://github.com/llvm/llvm-project/pull/84597#issuecomment-2079128332>
and confirmed by me locally, adding these attributes causes current GNU
ld to segfault when processing the input. Reverted so we can discuss
the best next step.