Centralise logic for setting credential manager app

Bug: 179180345
Test: atest KeyChainTests
Test: m RunKeyChainRoboTests
Change-Id: I4290bccf5ae04de0d84c7091729e86704b937295
Merged-In: I4290bccf5ae04de0d84c7091729e86704b937295
1 file changed