Inline (fully enable) Wakelocks in NMS

This removes both the flag (which was already released) and the DeviceConfig flag.

Also make the 30 second WakeLock timeout official. According to logs, the 99.9-th perecentile is 1.7 seconds while the 99.99th is 18, so this should be more than enough in normal circumstances.

Test: atest NotificationManagerServiceTest
Bug: 275044361
Change-Id: I8122cd2f5d028eea8bb5f2d6c6c35ee307af5b47