Bring insets fields back to AttachInfo

Some apps still use these fields. Remove them can make the app's
behavior unexpected. Although they shouldn't use these hidden APIs, it
won't cause any trouble if we bring the fields back. The user experiance
can keep the same.

NoNonSdkCheck: Revert Non-SDK API change
Fix: 174657478
Test: Steps in the bug.
Change-Id: I8da15ba3f66d20b4ac599db32539acb76d279978