Fix deadlock by not acquiring lock when reporting proximity

There is a deadlock situation from AttentionManagerService acquiring
lock before callings back to its clients with the proximity update. This
can cause a deadlock because the clients, while holding their own locks,
can call AttentionManagerService again.

Thread 1:
  Acquires attention lock -> AttentionManager Service reports proximityUpdate to VoiceInteraction -> tries to acquire voice lock

Thread 2:
  Acquires voice lock -> VoiceService tries to cancel proximity updates
  -> tries to acquire attention lock

The deadlock can be fixed by removing the acquiring attention lock step
before reporting proximityUpdates to the clients.

Bug: 261143716
Test: atest CtsAttentionServiceDeviceTestCases
Change-Id: I9f7d520cbcfd57032a9476853acad025fd7a6b95