[clang] [llvm] [AArch64] Add initial support for FUJITSU-MONAKA (PR #118432)

[David Green via cfe-commits]

davemgreen wrote:

> I prefer `-mcpu=fujitsu-monaka`. I want to include `fujitsu` because `FUJITSU-MONAKA` is the official name.
> 
> I fixed the issues related to sve2aes.

Sounds good, either sounds OK to me. LGTM

https://github.com/llvm/llvm-project/pull/118432