nios2: remove ARCH_WANT_OPTIONAL_GPIOLIB
This symbols is not needed to get access to selecting the GPIOLIB anymore: any arch can select GPIOLIB. Cc: Michael Büsch <m@bues.ch> Cc: nios2-dev@lists.rocketboards.org Acked-by: Ley Foon Tan <lftan@altera.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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