Set GPIO_ENTERING_RW before jumping between images.
Set GPIO_ENTERING_RW before jumping between images.

BUG=chrome-os-partner:10662
TEST=manual

1) Boot system with power+esc+refresh.  gpioget ENTERING_RW --> 0
2) reboot, then gpioget ENTERING_RW --> 1
3) Check EC_IN_RW signal on AP, if possible

Change-Id: I9de43eecf71654bf337d7a0e8b21f0cbcf386cc7
Signed-off-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/25624
Reviewed-by: Bill Richardson <129945214b1d548d8e49b6c29c43094f8c78057f@chromium.org>

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