Claude review: dt-bindings: display: rockchip: analogix-dp: Fix hclk as third clock for RK3588

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

Patch Review

Good approach. The binding change allows `hclk` as an alternative third clock name alongside `grf`, and then uses per-compatible `allOf` conditionals to constrain clock counts:

```yaml
      - enum:
        - grf
        - hclk
```

The per-compatible constraints look correct:
- RK3288: maxItems 2 (no third clock)
- RK3399: minItems 3 (requires `grf`)
- RK3588: minItems 3 (requires `hclk`)

**Minor observation:** The binding doesn't enforce *which* third clock name each SoC must use -- both `grf` and `hclk` are valid for all 3-clock SoCs. The RK3399 `allOf` block requires 3 clocks but doesn't constrain the third clock-name to `grf` specifically, and similarly RK3588 doesn't constrain it to `hclk`. This works because in practice DTS authors follow the convention, and the top-level enum restricts it to only these two valid names. Acceptable as-is, but a DTS could technically declare RK3399 with `hclk` and pass validation.

The Fixes tag is appropriate since this corrects the clock representation for RK3588.

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