Swich TEST_MAPPING config to unit_tests:true am: 95bc2fa724 am: 661527296a am: f2af9b2a17

Original change: https://android-review.googlesource.com/c/platform/system/timezone/+/1534500

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ic3e52b409a540df432696411804eceee4cb7fc9d