move short code definitions to SmsManager Test API

Bug: 127560420
Test: cts
Change-Id: I6a5ba2439713105b25913ba8eb081abfaafd1a2e
(cherry picked from commit 9c7fad923561869ae2a09f7d79d168e86c5718a1)
Merged-in: I6a5ba2439713105b25913ba8eb081abfaafd1a2e
4 files changed