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 network manager.

Derived by errorprone.

Bug: 73000847
Test: m
Change-Id: Ie2e0c239a6e59d934a2db4f9f3efdde177e8a4de
diff --git a/services/core/java/com/android/server/NetworkManagementService.java b/services/core/java/com/android/server/NetworkManagementService.java
index 74d8755..9631e46 100644
--- a/services/core/java/com/android/server/NetworkManagementService.java
+++ b/services/core/java/com/android/server/NetworkManagementService.java
@@ -2271,6 +2271,7 @@
         return ruleName;
     }
 
+    @GuardedBy("mRulesLock")
     private @NonNull SparseIntArray getUidFirewallRulesLR(int chain) {
         switch (chain) {
             case FIREWALL_CHAIN_STANDBY: