[llvm] ARM: Remove check for isAAPCS_ABI when enabling various aeabi calls (PR #152108)

[Saleem Abdulrasool via llvm-commits]

compnerd wrote:

Yeah, I felt that the goal was to just correct/unify the behavior across the two separate regions. I think that it is more about ensuring that we get the correct runtime call rather than dropping the option.

https://github.com/llvm/llvm-project/pull/152108