Claude review: gpu: nova-core: do not import firmware commands into GSP command module

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

**Status: Looks good**

Replaces `use fw::commands::*` with `use fw::self` and qualifies all references:

```rust
-            commands::*,
+            self,
```

Then e.g.:
```rust
-    type Command = GspSetSystemInfo;
+    type Command = fw::commands::GspSetSystemInfo;
```

And uses `Self::Command` where possible:
```rust
-        GspSetSystemInfo::init(self.pdev)
+        Self::Command::init(self.pdev)
```

The motivation is sound — the commit message explains that glob imports obscure which layer a type belongs to and prevent same-named types at different layers (which patch 5 uses for `UnloadingGuestDriver`). Good preparatory refactoring.

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Generated by Claude Code Patch Reviewer