[llvm] [AArch64] Remove TargetParser CPU/Arch feature tests (PR #104587)

[Tomas Matheson via llvm-commits]

tmatheson-arm wrote:

> Looks like with this we lose testing surface for the arch. Should `-print-enabled-extensions` be amended to also print that out?

I'm not sure what you mean, don't tests like https://github.com/llvm/llvm-project/blob/main/clang/test/Driver/print-enabled-extensions/aarch64-armv8-a.c cover it?

https://github.com/llvm/llvm-project/pull/104587