Claude review: dt-bindings: leds: backlight: add Silergy SY7758

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

Patch Review

The binding YAML and MAINTAINERS entry are clean and well-structured.

**Minor issue — example advertises properties the driver ignores:**

The DT example includes `max-brightness` and `default-brightness` (inherited from `common.yaml`):

```yaml
        backlight@36 {
            compatible = "silergy,sy7758";
            reg = <0x36>;
            max-brightness = <4080>;
            default-brightness = <1500>;
        };
```

These properties are defined in the common schema so they're valid from a binding perspective, but the driver (patch 2) hardcodes `MAX_BRIGHTNESS` and `DEFAULT_BRIGHTNESS` as `#define` constants and never reads them from DT. Either the driver should consume these properties, or the example should not include them (to avoid misleading DT authors into thinking they're functional).

**Nit:** The binding looks good otherwise — `allOf: - $ref: common.yaml#`, `unevaluatedProperties: false`, required properties, and the MAINTAINERS entry are all correct.

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