Mirror pending temp whitelist from AMS to ATMS (30/n)

Allows ATMS to get the pending temp whitelist for uids without calling
into AMS.
Also removed ATMS.mAm since this was the last reference to it.

Bug: 80414790
Test: Existing tests pass
Change-Id: I9eaff82c003b6a65e94adf7fad671c0cd7c56482