Frameworks: Annotate trivial @GuardedBy in services/core

Add @GuardedBy for simple functions that require locks and have a name in
one of the frameworks naming styles for locks ("^.*(Locked|LPw|LPr|L[a-zA-Z]|UL|AL|NL)$").

Changelist for activity manager.

Derived by errorprone. Manually remove mService.mAm changes, as the intended attribution
is to the mGlobalLock alias, but errorprone cannot handle that at the moment.

Bug: 73000847
Test: m
Change-Id: I4ed19f812e6310845d783b5b74988df0defca5e4