[Multi-user] Change more BackupManager AIDL methods to accept userId in methods

Bug: 120120742

Test: 1) atest RunFrameworksServicesRoboTests
2) atest $(find \
frameworks/base/services/tests/servicestests/src/com/android/server/backup \
-name '*Test.java')
3) atest CtsBackupTestCases
4) atest CtsBackupHostTestCases
5) atest GtsBackupTestCases
6) atest GtsBackupHostTestCases
7) 'adb shell bmgr' enabled/backupnow flow

Change-Id: Ia0641f66dd0a935420f1aee332bb2e21ca03610e