[clang] [Driver,AArch64] Remove AArch32-specific -m[no-]unaligned-access (PR #85441)

[Fangrui Song via cfe-commits]

MaskRay wrote:

If Apple platforms need this option, I can keep it recognized but only for Apple.

For ELF platforms, we should remove the GCC-unsupported-and-rejected aliases.

https://github.com/llvm/llvm-project/pull/85441