dt-bindings: vendor-prefixes: Add Alps

Alps Electric Co., Ltd. is a japanese electronics company:
https://www.alps.com/Signed-off-by: Nick Reitemeyer <nick.reitemeyer@web.de>
Reviewed-by: Stephan Gerhold <stephan@gerhold.net>
Tested-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -59,6 +59,8 @@ patternProperties:
     description: Allwinner Technology Co., Ltd.
   "^alphascale,.*":
     description: AlphaScale Integrated Circuits Systems, Inc.
+  "^alps,.*":
+    description: Alps Electric Co., Ltd.
   "^altr,.*":
     description: Altera Corp.
   "^amarula,.*":