dt-bindings: Add vendor prefix for Silicon Linux.

Add Silicon Linux to the list of devicetree vendor prefixes.

Website: http://www.si-linux.co.jpSigned-off-by: NBiju Das <biju.das@bp.renesas.com>
Signed-off-by: NFabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: NChris Paterson <Chris.Paterson2@renesas.com>
Reviewed-by: NAndreas Färber <afaerber@suse.de>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -361,6 +361,7 @@ sgx	SGX Sensortech
 sharp	Sharp Corporation
 shimafuji	Shimafuji Electric, Inc.
 si-en	Si-En Technology Ltd.
+si-linux	Silicon Linux Corporation
 sifive	SiFive, Inc.
 sigma	Sigma Designs, Inc.
 sii	Seiko Instruments, Inc.