dt-bindings: arm: sunxi: Add compatible for A20-OLinuXino-LIME-eMMC

Add compatible string for A20-OLinuXino-LIME2-eMMC to the
bindings documentation.
Signed-off-by: Stefan Mavrodiev <stefan@olimex.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>

Documentation/devicetree/bindings/arm/sunxi.yaml

@@ -561,6 +561,11 @@ properties:
           - const: olimex,a20-olinuxino-lime
           - const: allwinner,sun7i-a20
 
+      - description: Olimex A20-OlinuXino LIME (with eMMC)
+        items:
+          - const: olimex,a20-olinuxino-lime-emmc
+          - const: allwinner,sun7i-a20
+
       - description: Olimex A20-OlinuXino LIME2
         items:
           - const: olimex,a20-olinuxino-lime2