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This change copied gpio_init() from stm32f373 driver. BUG=chromium:688979 TEST=load on dev board and check button interrupt BRANCH=none Change-Id: I9dc12ffc02899211b6d07a640682899654c2bbed Signed-off-by: Rong Chang <rongchang@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/438909 Commit-Ready: Wei-Ning Huang <wnhuang@chromium.org> Tested-by: Wei-Ning Huang <wnhuang@chromium.org> Reviewed-by: Vincent Palatin <vpalatin@chromium.org>