dt-bindings: arm: sunxi: Add PocketBook 614 Plus

Add a new board name.
Signed-off-by: Denis Burkov <hitechshell@mail.ru>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20240415173416.13838-1-hitechshell@mail.ruSigned-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Documentation/devicetree/bindings/arm/sunxi.yaml

@@ -774,6 +774,11 @@ properties:
           - const: pocketbook,touch-lux-3
           - const: allwinner,sun5i-a13
 
+      - description: PocketBook 614 Plus
+        items:
+          - const: pocketbook,614-plus
+          - const: allwinner,sun5i-a13
+
       - description: Point of View Protab2-IPS9
         items:
           - const: pov,protab2-ips9