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Add PIN_CONFIG_BIAS_DISABLE configuration support for Spreadtrum pin
controller.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Link: https://lore.kernel.org/r/66d373ddee61e8be2fcef49aac5e80bd58f14915.1570596606.git.baolin.wang@linaro.org

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