dt-bindings: Add an entry for Purism SPC

Add an entry for Purism, SPC
Signed-off-by: Angus Ainslie (Purism) <angus@akkea.ca>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -683,6 +683,8 @@ patternProperties:
     description: PROBOX2 (by W2COMP Co., Ltd.)
   "^pulsedlight,.*":
     description: PulsedLight, Inc
+  "^purism,.*":
+    description: Purism, SPC
   "^qca,.*":
     description: Qualcomm Atheros, Inc.
   "^qcom,.*":