vboot: Set vb2_context flag VB2_CONTEXT_EC_SYNC_SLOW

If EC_SLOW_UPDATE is enabled, set the vb2_context flag
VB2_CONTEXT_EC_SYNC_SLOW, so that vboot can request display init before
performing EC reset for EC sync. This will reduce one reboot for EFS2 EC
sync.

BUG=b:350885214
TEST=emerge-geralt libpayload depthcharge
BRANCH=none

Cq-Depend: chromium:5676957
Change-Id: I761a56ee97713b6aec501a38bc0194d80c53da04
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/depthcharge/+/5678289
Reviewed-by: Julius Werner <jwerner@chromium.org>
1 file changed