Revert "NetworkStatsService: Fix getDetailedUidStats to take VPNs into account."

This reverts commit ed11b84131eae1e104af9be2c17fc9b07183eee3.

Reason for revert: This change has been implicated in 4-way deadlocks as seen in b/134244752.

Bug: 134244752
Change-Id: I0c00e8f0e30cee987b71b561079a97bf09d4dae4
5 files changed