ec: Run tests in normal and coverage mode
ec: Run tests in normal and coverage mode

As tests behave differently with coverage enabled, run the tests both
with and without coverage in the CQ.

BUG=None
TEST=./zephyr/firmware_builder.py --metrics=/tmp/metrics test ; echo $?
BRANCH=none

Signed-off-by: Jeremy Bettis <4df7b5147fee087dca33c181f288ee7dbf56e022@google.com>
Change-Id: I8188542ceaf3974f9debd8b574895313941a75e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3115430
Commit-Queue: Jeremy Bettis <4df7b5147fee087dca33c181f288ee7dbf56e022@chromium.org>
Tested-by: Jeremy Bettis <4df7b5147fee087dca33c181f288ee7dbf56e022@chromium.org>
Reviewed-by: Paul Fagerburg <d8c44b60afb21c60f56d931aa690ca1cf34910c8@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec