Remove tests directory

These tests were copied into platform/ec already.

BUG=b:177003034
TEST=CQ

Change-Id: Ie431891849bc2639a9ad978de051846c2059c52f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/zephyr-chrome/+/2627562
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Yuval Peress <peress@chromium.org>
Reviewed-by: Yuval Peress <peress@chromium.org>
9 files changed