devicetree: add Sigma Designs vendor prefix
devicetree: add Sigma Designs vendor prefix

Add the "sigma" vendor prefix for Sigma Designs, Inc.

Signed-off-by: Mans Rullgard <2c609ffb4e3675cc825ffc138f42668aebf8267d@mansr.com>
Signed-off-by: Rob Herring <fbb37eacae100e13076d5c4b46f06cfa4d6fa9f8@kernel.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs