Revert "Use ARMV8.2 scalar fp16<->fp32 conversion (#119895)" (#120001)
This reverts commit d833e2f2364a01c6fdab689a8bb5bbf55a5b60f7.
This is failing some RL builds internally using clang 13 D53791577
https://github.com/pytorch/pytorch/pull/119895#issuecomment-1946859332. The bot doesn't like a commit being merged into the stack base and fails to revert the PR.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/120001
Approved by: https://github.com/malfet
