[HWAsan Test]fix use-after-free bug

add mutex to synchronize data between threads to avoid accessing the released uid

Bug: 243728713
Signed-off-by: lihong8 <lihong8@xiaomi.corp-partner.google.com>
Change-Id: If5c3631bcea8424d6fb2667c7c45a826c81bf686
diff --git a/services/audiopolicy/service/AudioPolicyService.cpp b/services/audiopolicy/service/AudioPolicyService.cpp
index e7d945f..ce07dcd 100644
--- a/services/audiopolicy/service/AudioPolicyService.cpp
+++ b/services/audiopolicy/service/AudioPolicyService.cpp
@@ -1721,6 +1721,7 @@
 }
 
 bool AudioPolicyService::UidPolicy::isA11yOnTop() {
+    Mutex::Autolock _l(mLock);
     for (const auto &uid : mCachedUids) {
         if (!isA11yUid(uid.first)) {
             continue;