amarisoft/file_server: move serving directory

The binaries would get cleaned out of /tmp and this would cause
serving to fail.

BUG=None
TEST=deploy to amarisoft callbox, run, check logs

Change-Id: I3ed0cd906f7fe64f0a1219ab6046a1c432d06310
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/7726646
Reviewed-by: Andrew Lassalle <andrewlassalle@chromium.org>
Auto-Submit: Eric Caruso <ejcaruso@chromium.org>
Commit-Queue: Eric Caruso <ejcaruso@chromium.org>
Tested-by: Eric Caruso <ejcaruso@chromium.org>
3 files changed