update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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This is a list of things that need to be done to get this driver out of the
staging directory.
 
  - As suggested by Felix, rate control could be improved following this idea:
        https://lore.kernel.org/lkml/3099559.gv3Q75KnN1@pc-42/