dt-bindings: xilinx: zynq: Move Paralella board to Xilinx

Move the Adapteva Parallela board to Xilinx dt-bindings,
as it's based on a Zynq SoC from Xilinx
Signed-off-by: Luis Araneda <luaraneda@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

Documentation/devicetree/bindings/arm/adapteva.txt

-Adapteva Platforms Device Tree Bindings
----------------------------------------
-
-Parallella board
-
-Required root node properties:
-    - compatible = "adapteva,parallella";

Documentation/devicetree/bindings/arm/xilinx.txt

@@ -8,6 +8,9 @@ Required root node properties:
 
 Additional compatible strings:
 
+- Adapteva Parallella board
+  "adapteva,parallella"
+
 - Digilent Zybo Z7 board
   "digilent,zynq-zybo-z7"