Frameworks: Annotate trivial @GuardedBy in services/core

Add @GuardedBy for simple functions that require a single lock
and are named XYZLocked.

Derived by errorprone.

Bug: 73000847
Test: m
Test: m javac-check-framework RUN_ERROR_PRONE=true
Change-Id: I6993325b11c71a4ec27c21935fb54a954d95455f
diff --git a/services/core/java/com/android/server/net/NetworkPolicyManagerService.java b/services/core/java/com/android/server/net/NetworkPolicyManagerService.java
index a17dd12..f346629 100644
--- a/services/core/java/com/android/server/net/NetworkPolicyManagerService.java
+++ b/services/core/java/com/android/server/net/NetworkPolicyManagerService.java
@@ -4678,10 +4678,12 @@
         return subId;
     }
 
+    @GuardedBy("mNetworkPoliciesSecondLock")
     private int getSubIdLocked(Network network) {
         return mNetIdToSubId.get(network.netId, INVALID_SUBSCRIPTION_ID);
     }
 
+    @GuardedBy("mNetworkPoliciesSecondLock")
     private SubscriptionPlan getPrimarySubscriptionPlanLocked(int subId) {
         final SubscriptionPlan[] plans = mSubscriptionPlans.get(subId);
         return ArrayUtils.isEmpty(plans) ? null : plans[0];