Claude review: drm/msm: dp: handle the IRQ_HPD events reported by USB-C

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

Patch Review

Small, focused patch:

```c
if (extra_status == DRM_CONNECTOR_DP_IRQ_HPD)
    msm_dp_add_event(dp, EV_IRQ_HPD_INT, 0, 0);
```

This correctly reuses the existing `EV_IRQ_HPD_INT` event path that already handles IRQ_HPD from native HPD sources. The early return for `internal_hpd` at the top of the function also covers this new code path.

**Potential concern:** When both HPD connect and IRQ_HPD arrive simultaneously (initial connection with IRQ), both `EV_HPD_PLUG_INT` and `EV_IRQ_HPD_INT` are queued. The PLUG handler schedules async link training, so the IRQ_HPD handler may run before the link is fully trained. However, this is the same pattern as native HPD interrupt handling in `msm_dp_display_irq_handler()` where both interrupt bits can fire simultaneously, so the driver is already designed to handle this ordering.

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Generated by Claude Code Patch Reviewer