Centralise logic for setting credential manager app

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

keystore/java/android/security/IKeyChainService.aidl

@@ -60,7 +60,6 @@ interface IKeyChainService {
     byte[] getEncodedCaCertificate(String alias, boolean includeDeletedSystem);
     List<String> getCaCertificateChainAliases(String rootAlias, boolean includeDeletedSystem);
     void setCredentialManagementApp(String packageName, in AppUriAuthenticationPolicy policy);
-    void updateCredentialManagementAppPolicy(in AppUriAuthenticationPolicy policy);
     boolean hasCredentialManagementApp();
     String getCredentialManagementAppPackageName();
     AppUriAuthenticationPolicy getCredentialManagementAppPolicy();