Claude review: drm/connector: report IRQ_HPD events to drm_connector_oob_hotplug_event()

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

Patch Review

**Design:** The new `enum drm_connector_status_extra` is well-defined with good kerneldoc. Using a separate enum rather than overloading `drm_connector_status` is the right call -- these are orthogonal concepts (connection state vs. event type).

**drm_connector.c change** -- clean and minimal. The function signature gains the extra parameter, which is threaded through to `connector->funcs->oob_hotplug_event()` (done later in patch 2).

**displayport.c changes** -- the logic is correct:

```c
(hpd && irq_hpd) ? DRM_CONNECTOR_DP_IRQ_HPD :
                   DRM_CONNECTOR_NO_EXTRA_STATUS
```

IRQ_HPD only makes sense when HPD is asserted (connected), so the `hpd && irq_hpd` guard is correct per the DP spec. The disconnect paths correctly pass `DRM_CONNECTOR_NO_EXTRA_STATUS`.

The `dp_altmode_configured()` path correctly uses `dp->pending_irq_hpd` for deferred HPD events. No issues.

**Nit:** The cover letter has "singnalling" (typo for "signalling").

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