cellular: Add callbox configuration files

Add the configuration files used for the Amarisoft callbox used for
cellular tests.

BUG=None
TEST=None

Change-Id: I3d1ae85a80b60de70fcfe0ee3cef639fb8f34439
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/3852363
Reviewed-by: Pavan Holla <pholla@google.com>
Tested-by: Andrew Lassalle <andrewlassalle@chromium.org>
Commit-Queue: Pavan Holla <pholla@google.com>
Auto-Submit: Andrew Lassalle <andrewlassalle@chromium.org>
7 files changed