dt-bindings: Add vendor prefixes

These vendor prefixes are used by some routers supported
by e.g. OpenWrt.

- ADI Engineering is a US telecom equipment company.

- Arcom Controllers is a US manufacturer of repeaters.

- Freecom Gmbh is a german telecom equipment company.

- Gemtek Technology is a Taiwan telecom company.

- Gateway Communications was a telecommunication company,
now acquired by HKT Limited/PCCW.

- Goramo Gorecki is a privately owned Polish telecom
company.

- U.S. Robotics Corporation, known through their brand name
USRobotics is generally referred to as "USR" so use this
prefix for the company's device tree bindings.

Acked-by: Conor Dooley <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Linus Walleij <[e-mail]>

Documentation/devicetree/bindings/vendor-prefixes.yaml

···
     description: AD Holdings Plc.
   "^adi,.*":
     description: Analog Devices, Inc.
+  "^adieng,.*":
+    description: ADI Engineering, Inc.
   "^advantech,.*":
     description: Advantech Corporation
   "^aeroflexgaisler,.*":
···
     description: Arasan Chip Systems
   "^archermind,.*":
     description: ArcherMind Technology (Nanjing) Co., Ltd.
+  "^arcom,.*":
+    description: Arcom Controllers
   "^arctic,.*":
     description: Arctic Sand
   "^arcx,.*":
···
     description: FocalTech Systems Co.,Ltd
   "^forlinx,.*":
     description: Baoding Forlinx Embedded Technology Co., Ltd.
+  "^freecom,.*":
+    description: Freecom Gmbh
   "^frida,.*":
     description: Shenzhen Frida LCD Co., Ltd.
   "^friendlyarm,.*":
···
     description: FX Technology Ltd.
   "^gardena,.*":
     description: GARDENA GmbH
+  "^gateway,.*":
+    description: Gateway Communications
   "^gateworks,.*":
     description: Gateworks Corporation
   "^gcw,.*":
···
     description: GE Fanuc Intelligent Platforms Embedded Systems, Inc.
   "^gemei,.*":
     description: Gemei Digital Technology Co., Ltd.
+  "^gemtek,.*":
+    description: Gemtek Technology Co., Ltd.
   "^genesys,.*":
     description: Genesys Logic, Inc.
   "^geniatech,.*":
···
     description: Shenzhen Huiding Technology Co., Ltd.
   "^google,.*":
     description: Google, Inc.
+  "^goramo,.*":
+    description: Goramo Gorecki
   "^gplus,.*":
     description: GPLUS
   "^grinn,.*":
···
     description: United Radiant Technology Corporation
   "^usi,.*":
     description: Universal Scientific Industrial Co., Ltd.
+  "^usr,.*":
+    description: U.S. Robotics Corporation
   "^utoo,.*":
     description: Aigo Digital Technology Co., Ltd.
   "^v3,.*":