Unbind TileService onNullBinding

Test: atest TileLifecycleManagerTest
Test: manual: adb shell dumpsys activity service
Test: sts test
Bug: 300903792
Change-Id: Ia8126ac65432b124683960e3ebf47301ba6172a1
Merged-In: Ia8126ac65432b124683960e3ebf47301ba6172a1
2 files changed