dt-bindings: vendor-prefixes: Add an entry for Protonic Holland

Add "prt" entry for Protonic Holland: https://www.protonic.nl/en/Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -808,6 +808,8 @@ patternProperties:
     description: Primux Trading, S.L.
   "^probox2,.*":
     description: PROBOX2 (by W2COMP Co., Ltd.)
+  "^prt,.*":
+    description: Protonic Holland
   "^pulsedlight,.*":
     description: PulsedLight, Inc
   "^purism,.*":