dt-bindings: vendor-prefixes: Add smi

Add Silicon Mortion Technology Corporation
https://www.siliconmotion.com/

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/c8aaf67e3fcdb7e60632c53a784691aabfc7733e.1704788539.git.ysato@users.sourceforge.jp
Signed-off-by: Rob Herring <robh@kernel.org>

Author: Yoshinori Sato

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -1281,6 +1281,8 @@ patternProperties:
     description: Skyworks Solutions, Inc.
   "^smartlabs,.*":
     description: SmartLabs LLC
+  "^smi,.*":
+    description: Silicon Motion Technology Corporation
   "^smsc,.*":
     description: Standard Microsystems Corporation
   "^snps,.*":