system_ColdBoot: Use normal instead of short power button press

This test is generic and might be run on platforms without an EC
which guarantees that power_short_press() will work. Since the
goal is simply to power on the system in this case,
power_normal_press() should be used as a safer alternative.

BUG=chrome-os-partner:44275
BRANCH=firmware-veyron
TEST=system_ColdBoot now succeeds on veyron_mickey

Change-Id: I18c89027d29de03fcdc0113826935113d99e6d45
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/295189
Reviewed-by: Wai-Hong Tam <waihong@chromium.org>
1 file changed