Fix TimeZoneDetectorStatsTest so it works on Auto

Not all devices have telephony. This commit fixes the
TimeZoneDetectorStatsTest so it can correctly determine the expected
value reported by metrics.

Bug: 187907947
Test: atest hostsidetests/time/host/src/android/time/cts/host/TimeZoneDetectorStatsTest.java
Change-Id: I6fd95a55d8c11e50e9683c0e7e3e66cbd8a6f031
3 files changed