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

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ic0b8d84bd1d484488e288410eb0acb40785adaf9