[llvm] [LLVM] Update ARM maintainer (PR #117002)

[David Green via llvm-commits]

davemgreen wrote:

Cool. Hmm... I'm not sure if it is very useful to have just me in the list, I'm just trying to help. In reality a lot of people have been helping out with the Arm backend for a long time and it would be a shame if we disrupted that. I would consider putting "Arms compiler team" as the first member on the list, but I can see that's not always very useful to people. I would suggest adding @ostannard for the assembly/disassembly, as he knows a lot more about that area than me. @eefriedman has done a lot of work over the years, I'm not sure if he would want the be on the list. We should find someone who looks after target parser too. The arm abi I would add @smithp35 to but that seems to be a separate section. @nasherm mentioned he was interested recently too.

Can we expand this a little to something like this, although maybe the "Arm's Compiler Team" could do with a better explanation.

```
#### ARM backend

Arm's Compiler Team \
David Green  david.green at arm.com (email), [davemgreen](https://github.com/davemgreen) (GitHub) \
Oliver Stannard  oliver.stannard at arm.com (email), [ostannard](https://github.com/ostannard) (GitHub) \
Nashe Mncube  nashe.mncube at arm.com (email), [nasherm](https://github.com/nasherm) (GitHub)
```

https://github.com/llvm/llvm-project/pull/117002