gpio: vx855: fixed a typo

we had written "betwee" rather than "between".

Signed-off-by: Sachin agarwal <asachin591@gmail.com>
Link: https://lore.kernel.org/r/20200112143312.66048-1-sachinagarwal@sachins-MacBook-2.local


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