stm32: fix AP auto power on
stm32: fix AP auto power on

The logic introduced by CL 28139 was incorrect
(ie it just sets to 0 the auto_power_on variable which is already 0)
For software sync, we always want to power the AP.

Signed-off-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

BUG=chrome-os-partner:13126
TEST=on Snow, cold reset the EC and see the AP firmware booting.
in U-Boot console, type "mbkp reboot cold" and see the AP rebooting
instead of shutting down.
BRANCH=snow

Change-Id: Ib88f75a8b159015df708c041cdc14153fe8736a9
Reviewed-on: https://gerrit.chromium.org/gerrit/31370
Reviewed-by: Bill Richardson <129945214b1d548d8e49b6c29c43094f8c78057f@chromium.org>
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>
Commit-Ready: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>
Tested-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

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