Renaming "moxart_gpio_base" to "base" allows better fit,
remove line breaks in moxart_gpio_get().

While doing trivial cleanup, also remove fields initialized
with zero in moxart_template_chip.
Signed-off-by: NJonas Jensen <jonas.jensen@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>