[PATCH] dt-bindings: mtd: Fix nand-controller.yaml license

[Rob Herring]

On Thu, Jun 22, 2023 at 11:24:15PM +0200, Miquel Raynal wrote:
> Binding files should be dual licensed, this file was writtent with the
> idea in mind of following the rules, but the SPDX tag did not reflect
> that correctly. Fix the tag so we are sure this file is licensed
> correctly.

Yes, we do want dual license, but things converted from txt bindings 
need those authors' permission as the txt bindings are all implicitly 
GPLv2. That didn't happen here, so we kept the default implicit license. 
Looks like this case is all Bootlin authors for significant parts of the 
original txt binding, so you should be good on that part (assuming your 
employer agrees). Maxime did the schema, so need his permission too.

Note I have blanket permission on dual licensing from several companies 
for DT files. It would be nice to get the same from Bootlin.

Rob