dt: Add vendor prefix 'shimafuji'

Add Shimafuji Electric, Inc. to the list of device tree vendor
prefixes
Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -297,6 +297,7 @@ sensirion	Sensirion AG
 sff	Small Form Factor Committee
 sgx	SGX Sensortech
 sharp	Sharp Corporation
+shimafuji	Shimafuji Electric, Inc.
 si-en	Si-En Technology Ltd.
 sigma	Sigma Designs, Inc.
 sii	Seiko Instruments, Inc.