[Multi-user] Change PackageManagerService to pass in userId to

restoreAtInstall.

Bug: 121198024

Test: 1) atest RunBackupFrameworksServicesRoboTests
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

Change-Id: I880bff4903b373888a1031bda60ef43ecf448420