[MediaProjection][Security] Consistent locking on token

Fix deadlock in MediaProjectionManagerService by ensuring
MediaProjectionManagerService never holds the lock when invoking a
method that will acquire the WindowManagerService lock.

Bug: 261168256
Test: Manual
Change-Id: I12506081e1d173e8210ff29ef3992c3bfcf82841
Merged-In: I12506081e1d173e8210ff29ef3992c3bfcf82841