SettingsLib: Add API to get identity address

Bug: 197044261
Test: build pass
Change-Id: Idd03d7777c8257986b03dd1ba19aac5514f4f18d
Merged-In: Idd03d7777c8257986b03dd1ba19aac5514f4f18d
(cherry picked from commit a393bf9d25a5480a5b11d04a5ca7cca2ffab939f)
1 file changed