Claude review: arm64: dts: mediatek: mt8167: Add DRM nodes

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

Patch Review

This is the main DTS patch adding all display-related nodes. The display pipeline is correctly wired:

> +			mmsys_main: endpoint@0 {
> +				reg = <0>;
> +				remote-endpoint = <&ovl0_in>;
> +			};

through to:

> +			port@0 {
> +				reg = <0>;
> +				dsi_in: endpoint {
> +					remote-endpoint = <&rdma0_out>;
> +				};
> +			};

This pipeline (mmsys -> OVL0 -> COLOR -> CCORR -> AAL -> GAMMA -> DITHER -> RDMA0 -> DSI) matches the `mt8167_mtk_ddp_main` array already in `mtk_drm_drv.c`. The ext path (mmsys endpoint@1 -> rdma1) is also present with rdma1 set to `status = "disabled"`.

The new nodes are correctly ordered by MMIO address, maintaining the ordering established in patch 1. The `mmsys` node appropriately gains a `power-domains` property. All blocks that need it have `iommus`, `power-domains`, `clocks`, and `interrupts` properties. The `dsi` and `mipi_tx` nodes are both `status = "disabled"` by default, to be enabled per board. Already has a Reviewed-by from AngeloGioacchino Del Regno.

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