[llvm] [LLVM] Update RISCV maintainers (PR #121301)

[Nikita Popov via llvm-commits]

================
@@ -250,6 +250,10 @@ czhengsz at cn.ibm.com (email), [chenzheng1030](https://github.com/chenzheng1030) (
 
 Alex Bradbury \
 asb at igalia.com (email), [asb](https://github.com/asb) (GitHub)
----------------
nikic wrote:

```suggestion
asb at igalia.com (email), [asb](https://github.com/asb) (GitHub) \
```

https://github.com/llvm/llvm-project/pull/121301