falco: fix RCIN# GPIO setting
falco: fix RCIN# GPIO setting

The gpio pin used for RCIN# should be configured as open drain as the
rail is pulled up by a non-EC rail. Driving it high would leak power.

BUG=chrome-os-partner:19355,chrome-os-partner:20173
BRANCH=none
TEST=manual: boot on falco without RCIN# causing reset and
the 'apreset warm' EC command works as expected.

Change-Id: I197928fd3cac27db3add9dd842e3171f23c9d71e
Signed-off-by: Duncan Laurie <70662b43bc1a20b57ded72a2b08be88dd0da4841@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/58590

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