dt-bindings: xilinx: zynq: Sort entries alphabetically

Sort additional compatible strings (boards) alphabetically
by their manufacturer and model number

This will help when finding a board because they
will be grouped by their manufacturer
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/xilinx.txt

@@ -8,6 +8,9 @@ Required root node properties:
 
 Additional compatible strings:
 
+- Digilent Zybo Z7 board
+  "digilent,zynq-zybo-z7"
+
 - Xilinx CC108 internal board
   "xlnx,zynq-cc108"
 
@@ -17,9 +20,6 @@ Additional compatible strings:
   "xlnx,zynq-zc770-xm012"
   "xlnx,zynq-zc770-xm013"
 
-- Digilent Zybo Z7 board
-  "digilent,zynq-zybo-z7"
-
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 Xilinx Zynq UltraScale+ MPSoC Platforms Device Tree Bindings