dt-bindings: add compatible vendor prefix for CUI Devices

Add vendor prefix for CUI Devices.

Signed-off-by: Angelo Dureghello <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/vendor-prefixes.yaml

···
     description: Shenzen Chuangsiqi Technology Co.,Ltd.
   "^cubietech,.*":
     description: Cubietech, Ltd.
+  "^cui,.*":
+    description: CUI Devices
   "^cypress,.*":
     description: Cypress Semiconductor Corporation
   "^cznic,.*":