dt-bindings: Add Xylon vendor prefix

Xylon is an electronics company that produces FPGA hardware block designs
optimized for Xilinx FPGAs.
Signed-off-by: NPaul Kocialkowski <paul.kocialkowski@bootlin.com>
Acked-by: NRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20191203141243.251058-2-paul.kocialkowski@bootlin.comSigned-off-by: NLinus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -1060,6 +1060,8 @@ patternProperties:
     description: Xilinx
   "^xunlong,.*":
     description: Shenzhen Xunlong Software CO.,Limited
+  "^xylon,.*":
+    description: Xylon
   "^yones-toptech,.*":
     description: Yones Toptech Co., Ltd.
   "^ysoft,.*":