dt-bindings: vendor-prefixes: Add Ctera Networks

CTERA Networks Intl. is a company based in Israel.
They manufacture NASes, network devices and provide software
products for cloud storage and IT security.

Signed-off-by: Pawel Dembicki <[e-mail]>
Signed-off-by: Gregory CLEMENT <[e-mail]>

Documentation/devicetree/bindings/vendor-prefixes.yaml

···
     description: Hangzhou C-SKY Microsystems Co., Ltd
   "^csq,.*":
     description: Shenzen Chuangsiqi Technology Co.,Ltd.
+  "^ctera,.*":
+    description: CTERA Networks Intl.
   "^cubietech,.*":
     description: Cubietech, Ltd.
   "^cui,.*":