dt-bindings: add compatible vendor prefix for CUI Devices

Add vendor prefix for CUI Devices.
Signed-off-by: Angelo Dureghello <angelo.dureghello@timesys.com>
Link: https://lore.kernel.org/r/20210821082658.4147595-2-angelo.dureghello@timesys.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -271,6 +271,8 @@ patternProperties:
     description: Shenzen Chuangsiqi Technology Co.,Ltd.
   "^cubietech,.*":
     description: Cubietech, Ltd.
+  "^cui,.*":
+    description: CUI Devices
   "^cypress,.*":
     description: Cypress Semiconductor Corporation
   "^cznic,.*":