gpio: tegra: Improve formatting of the code

Don't cross 80 chars of line length in order to keep formatting of the
code consistent.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>