Revert "[User Manager] Add NETWORK_STACK permission."

This reverts commit 633f19a08ec0c5805c8b331d47898da444e0c9cf.

Reason for revert: fails CTS test. Cannot add this for security reasons: b/243542908

Change-Id: I35f06ae38776eb58c1ec5e7e1252084e36a42617
1 file changed