volteer: build volteer as Chrome application

BUG=b:169935794
TEST=flash on volteer proto2 and verify that gettime console command is
present (although there is an issue with the printk statements, see
https://github.com/zephyrproject-rtos/zephyr/pull/28882 for a fix)

Cq-Depend: chromium:2446028
Change-Id: Ie12a2bcdf98e81be3887ac5f4d2e0dd0551c12d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/zephyr-chrome/+/2447010
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Tested-by: Jett Rink <jettrink@chromium.org>
2 files changed