gpio: mm-lantiq: Fix small typo

Fix a spelling typo in gpio-mm-lantiq.c by codespell
s/dont/don't/

Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
Link: https://lore.kernel.org/r/20200424154103.10311-3-zhengdejin5@gmail.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>