dt-bindings: add vendor prefix for ssi

Add vendor prefix for SSI Computer Corp (https://www.ssi.com.tw/)
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -1104,6 +1104,8 @@ patternProperties:
     description: SparkFun Electronics
   "^sprd,.*":
     description: Spreadtrum Communications Inc.
+  "^ssi,.*":
+    description: SSI Computer Corp
   "^sst,.*":
     description: Silicon Storage Technology, Inc.
   "^sstar,.*":