Report data to ApplicationLocalesChanged atom.

Registers atom everytime the API setApplicationLocales
is called.

Bug: 205502201
Metrics council bug: 204852948

Test: make statsd_testdrive
Test: atest ApplicationLocalesChangedAtomTests
Test: atest LocaleManagerHostTest
Test: atest CtsLocaleManagerTestCases
Test: atest WmTests:ActivityTaskManagerServiceTests

Change-Id: Ic9ea16c025a0d1ffbbed9851f1f9e27d7740739c