slippy: Enable internal pullup for recovery pin
slippy: Enable internal pullup for recovery pin

The recovery pin input from servo is open drain and needs
an internal pullup enabled so it is not always low.

BUG=chrome-os-partner:19398
BRANCH=none
TEST=manual: ensure rec_mode can be turned off

$ dut-control rec_mode:off rec_mode
rec_mode:off

Change-Id: I387a53eb5b64bb0bf3a87fc47b5cca9b2063f6a9
Signed-off-by: Duncan Laurie <70662b43bc1a20b57ded72a2b08be88dd0da4841@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/50993

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