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The pin has a 100k series resistor, which is overwhelmed by the
internal pullup.
BUG=chrome-os-partner:23489
BRANCH=none
TEST=gpioget wp_l, with screw present and removed. With screw present,
signal should read 0; with it removed it should read 1.
Change-Id: I35ee867111d0d7e8626dd3ac8010e9a10f46ccf7
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/174094
Reviewed-by: Aaron Durbin <adurbin@chromium.org>