Refactor PointerChoreographer lock

Pointer choreographer and WindowInfoListener use separate locks which
is problematic. As WindowInfosUpdate callback is triggered from the
display thread, a deadlock might occur due to race between display and
reader thread. Both trying to acquire both the locks.

This becomes much more likely when we have multiple displays connected.

Test: Verify pointer indicators are hidden on screenshots of secure windows
Test: atest inputflinger_tests
Bug: 367660694
Flag: EXEMPT refactor

Change-Id: I7417c0071322a093643734432f8f0236bd89a317