gpiolib: clean up debugfs separator handling

Add the newline separator before generating the gpio chip entry to make
the code easier to read.

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20241028125000.24051-4-johan+linaro@kernel.org


Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>