gpiolib: Extract mask allocation into subroutine
We're going to use similar code to allocate and set all the bits in a mask for valid gpios to use. Extract the code from the irqchip version so it can be reused. Signed-off-by: NStephen Boyd <swboyd@chromium.org> Tested-by: NTimur Tabi <timur@codeaurora.org> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
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