dt-bindings: mtd: mediatek,nand-ecc-engine: Add compatible for MT7986

Add dt-bindings documentation of ECC for MediaTek MT7986 SoC
platform.

Signed-off-by: Xiangsheng Hou <xiangsheng.hou@mediatek.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230201021500.26769-5-xiangsheng.hou@mediatek.com

Author: mtk-xiangsheng

Documentation/devicetree/bindings/mtd/mediatek,nand-ecc-engine.yaml

@@ -18,6 +18,7 @@ properties:
       - mediatek,mt2701-ecc
       - mediatek,mt2712-ecc
       - mediatek,mt7622-ecc
+      - mediatek,mt7986-ecc
 
   reg:
     items: