Add cross-platform transfer support to getEligibilityRulesForRestoreAtInstall

The eligibility rules used for a restore at install should support
cross-platform transfer if that was used for the initial system restore.

Bug: 432673356
Flag: com.android.server.backup.enable_cross_platform_transfer
Test: atest UserBackupManagerServiceTest.java
Change-Id: I1d9881bdfa8885414cbd70ce90b55fbc5c50e5cf