Claude review: drm/bridge: synopsys: dw-dp: Unregister AUX channel on bridge detach

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

Patch Review

**Verdict: Good**

The AUX channel is registered in `dw_dp_bind()` via `drm_dp_aux_register()` but was never unregistered, leading to a use-after-free when the module is reloaded (as demonstrated by the KASAN trace in the commit message). Adding `drm_dp_aux_unregister()` in a `bridge_detach` callback is the correct place for this cleanup, as it's the symmetric counterpart to registration happening during bind (which triggers bridge attach).

```c
+static void dw_dp_bridge_detach(struct drm_bridge *bridge)
+{
+	struct dw_dp *dp = bridge_to_dp(bridge);
+	drm_dp_aux_unregister(&dp->aux);
+}
```

The `Fixes:` tag references the correct commit. Good fix.

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