dt-bindings: vendor-prefixes: add smartrg

SmartRG described itself as a CPE manufacturer and produced few home
network devices (e.g. wireless routers). Their SmartRG SR400ac router
(smartrg,sr400ac) is covered by in-Linux DT binding and DTS file.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240212140839.27150-1-zajec5@gmail.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -1297,6 +1297,8 @@ patternProperties:
     description: Skyworks Solutions, Inc.
   "^smartlabs,.*":
     description: SmartLabs LLC
+  "^smartrg,.*":
+    description: SmartRG, Inc.
   "^smi,.*":
     description: Silicon Motion Technology Corporation
   "^smsc,.*":