Allow alternative time zone ID to be set device's zone.

If America/Godthab is set as device time zone, display it as if
America/Nuuk is chosen.
If time zone is known, but is not an alternative and not shown
in time zone picker, region will de derived from user's locale.

Bug: 155738410
Test: atest com.android.settings.datetime.timezone.model
Test: set persist.sys.timezone via adb and checked
Date & Time screen

Change-Id: I168fb4319e144dbe9e2496d06a681d4c09b411c0

src/com/android/settings/datetime/timezone/model/TimeZoneData.java

@@ -71,7 +71,7 @@ public class TimeZoneData {
         Set<String> regionIds = new ArraySet<>();
         for (CountryTimeZones countryTimeZone : countryTimeZones) {
             FilteredCountryTimeZones filteredZones = new FilteredCountryTimeZones(countryTimeZone);
-            if (filteredZones.getTimeZoneIds().contains(tzId)) {
+            if (filteredZones.matches(tzId)) {
                 regionIds.add(filteredZones.getRegionId());
             }
         }