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

[Jon Roelofs via llvm-commits]

jroelofs wrote:

This part of the test that checks that `cortex-a520` is `armv9.2-a` isn't covered by the `-print-enabled-extensions` tests:

```
AArch64CPUTestParams("cortex-a520", "armv9.2-a",
```

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