dt-bindings: vendor-prefixes: Add SmartFiber

Add "smartfiber" vendor prefix for manufactorer of EcoNet based boards.

Signed-off-by: Caleb James DeLisle <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Philippe Mathieu-Daudé <[e-mail]>
Signed-off-by: Thomas Bogendoerfer <[e-mail]>

Documentation/devicetree/bindings/vendor-prefixes.yaml

···
     description: SKOV A/S
   "^skyworks,.*":
     description: Skyworks Solutions, Inc.
+  "^smartfiber,.*":
+    description: ShenZhen Smartfiber Technology Co, Ltd.
   "^smartlabs,.*":
     description: SmartLabs LLC
   "^smartrg,.*":