dt-bindings: arm64: dts: mediatek: Add Acelink EW-7886CAX access point

Acelink EW-7886CAX is an MT7986A (AKA Filogic 830) based access point.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20231207080512.3688-2-zajec5@gmail.comSigned-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Documentation/devicetree/bindings/arm/mediatek.yaml

@@ -89,6 +89,7 @@ properties:
           - const: mediatek,mt7981b
       - items:
           - enum:
+              - acelink,ew-7886cax
               - bananapi,bpi-r3
               - mediatek,mt7986a-rfb
           - const: mediatek,mt7986a