board/volteer: Enable EC Software Sync

Enable EC Software Sync which is synonymous with EC being present in the
board. This will ensure that vboot callbacks for EC is enabled. In a
follow-up CL, this config will be renamed to match its purpose.

BUG=b:180965428
BRANCH=volteer
TEST=Builds

Change-Id: I6e8511740c316f789610e03485560e03181392a1
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/depthcharge/+/2714962
Tested-by: Zhuohao Lee <zhuohao@chromium.org>
Reviewed-by: YH Lin <yueherngl@chromium.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Commit-Queue: Tim Wawrzynczak <twawrzynczak@chromium.org>
(cherry picked from commit d77f44ce0e40bfded8f0332a44b8cc7085ee8627)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/depthcharge/+/2718204
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Commit-Queue: YH Lin <yueherngl@chromium.org>
Tested-by: YH Lin <yueherngl@chromium.org>
7 files changed