[llvm] [NFC] Add myself to CODEOWNERS for AMD dialects (PR #164289)

[Jakub Kuderski via llvm-commits]

================
@@ -53,6 +53,13 @@
 /mlir/include/mlir/Interfaces/DestinationStyleOpInterface.* @matthias-springer
 /mlir/lib/Interfaces/DestinationStyleOpInterface.* @matthias-springer
 
+# AMDGPU and ROCDL dialects in MLIR
----------------
kuhar wrote:

```suggestion
# AMDGPU and ROCDL dialects in MLIR.
```

https://github.com/llvm/llvm-project/pull/164289