rambi: Remove internal pullup from write protect pin
rambi: Remove internal pullup from write protect pin

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 <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/174094
Reviewed-by: Aaron Durbin <af0622ab041e8b0f8e5819838dcc93898196e71f@chromium.org>

akappy7/ChromeOS_EC_LED_Diagnostics,md5555/ec,longsleep/ec,gelraen/cros-ec,md5555/ec,thehobn/ec,coreboot/chrome-ec,fourier49/BZ_DEV_EC,coreboot/chrome-ec,coreboot/chrome-ec,md5555/ec,mtk09422/chromiumos-platform-ec,eatbyte/chromium-ec,thehobn/ec,longsleep/ec,alterapraxisptyltd/chromium-ec,gelraen/cros-ec,akappy7/ChromeOS_EC_LED_Diagnostics,mtk09422/chromiumos-platform-ec,akappy7/ChromeOS_EC_LED_Diagnostics,mtk09422/chromiumos-platform-ec,longsleep/ec,thehobn/ec,gelraen/cros-ec,coreboot/chrome-ec,fourier49/BIZ_EC,eatbyte/chromium-ec,alterapraxisptyltd/chromium-ec,alterapraxisptyltd/chromium-ec,eatbyte/chromium-ec,thehobn/ec,fourier49/BZ_DEV_EC,fourier49/BIZ_EC,alterapraxisptyltd/chromium-ec,fourier49/BZ_DEV_EC,md5555/ec,fourier49/BIZ_EC,gelraen/cros-ec,fourier49/BIZ_EC,akappy7/ChromeOS_EC_LED_Diagnostics,mtk09422/chromiumos-platform-ec,coreboot/chrome-ec,longsleep/ec,coreboot/chrome-ec,eatbyte/chromium-ec,fourier49/BZ_DEV_EC,akappy7/ChromeOS_EC_LED_Diagnostics