Obtain SubInfo with shell identity to access ICC ID

Access to SubscriptionInfo#getIccId is now guarded behind the identifier
access restrictions introduced in Android 10 by removing the ICC ID
in the SubscriptionController before the results are returned to the
caller. To verify SubscriptionInfo tests that require a valid ICC
ID the SubscriptionInfo must be obtained with the shell identity
which has access to identifiers.

Bug: 131909991
Test: atest SubscriptionManagerTest
Change-Id: I7052fc619cc57f605c83824b75da2511c42ae996