DO NOT MERGE. Persistable Uri grants still require permissions.

When FLAG_GRANT_PERSISTABLE_URI_PERMISSION is requested, we still
need to check permissions between the source and target packages,
instead of shortcutting past them.

The spirit of the original change is remains intact: if the caller
requested FLAG_GRANT_PERSISTABLE_URI_PERMISSION, then we avoid
returning "-1", which would prevent the grant data structure from
being allocated.

Bug: 111934948
Test: atest android.appsecurity.cts.AppSecurityTests
Change-Id: Ief0fc922aa09fc3d9bb6a126c2ff5855347cd030
Merged-In: Ief0fc922aa09fc3d9bb6a126c2ff5855347cd030