dt-bindings: vendor-prefixes: Document ifm electronic gmbh

ifm is a manufacturer of industrial sensors, control technology and
automation solutions. Document their vendor prefix, which is already
used for ifm,ac14xx and other powerpc devices.

Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Marek Vasut <marex@nabladev.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Author: Marek Vasut

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -755,6 +755,8 @@ patternProperties:
     description: IEI Integration Corp.
   "^ifi,.*":
     description: Ingenieurburo Fur Ic-Technologie (I/F/I)
+  "^ifm,.*":
+    description: ifm electronic gmbh
   "^ilitek,.*":
     description: ILI Technology Corporation (ILITEK)
   "^imagis,.*":