API Review: Define the extras as containing CharSequences, not Strings

Test: atest FrameworksTelephonyTests:ImsPhoneTest
Bug: 150331517
Fixes: 151172931
Merged-In: I7c6f4c13e6267a3e643ebae77697ea18ee8cd242
Change-Id: I7c6f4c13e6267a3e643ebae77697ea18ee8cd242
1 file changed