[PATCH] devtools: ignore .gitignore in SPDX check

[Thomas Monjalon]

07/02/2025 19:26, Stephen Hemminger:
> New .gitignore file in dts was getting marked as error.
> Change to ignore all .gitignore files.

Actually I would prefer we don't create too much .gitignore files.
It is easier to manage if we have all in a single .gitignore.
We have already a line for DTS in the main .gitignore,
so it would be more consistent to move the recent additions
in dts/.gitignore to the root .gitignore.