zephyr: delete the app directory

Moved to platform/ec in the CQ dep CL.

BUG=b:177157241
TEST=zmake testall

Cq-Depend: chromium:2622901
Change-Id: I8778d3f99b9c4612467f5e6ac4d498f3bf507c6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/zephyr-chrome/+/2623408
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Yuval Peress <peress@chromium.org>
8 files changed