Claude review: drm: bridge: dw_hdmi: Merge top and bottom half IRQ handlers

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

Patch Review

Since the bottom half now only calls `mod_delayed_work()` (which is safe from hardirq context), the threaded IRQ is no longer needed:

```c
-	ret = devm_request_threaded_irq(dev, irq, dw_hdmi_hardirq,
-					dw_hdmi_irq, IRQF_SHARED,
-					dev_name(dev), hdmi);
+	ret = devm_request_irq(dev, irq, dw_hdmi_hardirq, IRQF_SHARED,
+			       dev_name(dev), hdmi);
```

The merged handler now masks with `HDMI_IH_PHY_STAT0_HPD` upfront:
```c
+	intr_stat = hdmi_readb(hdmi, HDMI_IH_PHY_STAT0) & HDMI_IH_PHY_STAT0_HPD;
```

Only the HPD bit is cleared in the sticky register, which is correct since RX_SENSE is fully masked after patch 17. The mute/unmute dance within the HPD block is preserved correctly.

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