dt-bindings: arm: mediatek: mmsys: Add OF graph support for board path

Document OF graph on MMSYS/VDOSYS: this supports up to three DDP paths
per HW instance (so potentially up to six displays for multi-vdo SoCs).

The MMSYS or VDOSYS is always the first component in the DDP pipeline,
so it only supports an output port with multiple endpoints - where each
endpoint defines the starting point for one of the (currently three)
possible hardware paths.

Reviewed-by: Rob Herring (Arm) <[email protected]>
Reviewed-by: Alexandre Mergnat <[email protected]>
Tested-by: Alexandre Mergnat <[email protected]>
Reviewed-by: CK Hu <[email protected]>
Tested-by: Michael Walle <[email protected]> # on kontron-sbc-i1200
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: AngeloGioacchino Del Regno <[email protected]>

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