Claude review: dt-bindings: regulator: document the Renesas R63419 based dual-DSI video mode Display Panels

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

Patch Review

**Subject line error:** The subject says `dt-bindings: regulator:` but this is a display panel binding, not a regulator binding. It should be `dt-bindings: display: panel:` to match the file path and convention.

**Should reference `panel-common-dual.yaml`:** The binding currently does:
```yaml
allOf:
  - $ref: panel-common.yaml#
```
Since this is a dual-DSI panel with `ports` containing `port@0` and `port@1`, it should reference `panel-common-dual.yaml#` instead, as other dual-DSI panel bindings do (e.g., `himax,hx83121a.yaml`, `novatek,nt35950.yaml`). This provides proper schema validation for the dual-port structure.

**Supply descriptions missing:** The supplies (`vdd-supply`, `vddio-supply`, etc.) are declared as `true` without descriptions. Other bindings (e.g., `himax,hx83121a.yaml`) add brief description strings explaining what each supply powers. Not strictly required but improves documentation quality.

**Minor:** The example has `vsn-supply` and `vsp-supply` listed in a different order than the property definitions (the properties list `vsp` before `vsn`, but the example swaps them). This is cosmetically inconsistent but functionally fine.

Otherwise the binding structure looks correct — compatibles, supplies, required properties, and the dual-port example all look reasonable.

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