Fix concurrent modify exception for A11y

Bug: 180524510
Test: manual test

Change-Id: I9f0087c99872633f27a7e5b8355087d03ea2cb00
Signed-off-by: liulvping <liulvping@xiaomi.com>

services/accessibility/java/com/android/server/accessibility/AccessibilityManagerService.java

@@ -766,6 +766,10 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub
             // performs the current profile parent resolution.
             final int resolvedUserId = mSecurityPolicy
                     .resolveCallingUserIdEnforcingPermissionsLocked(userId);
+
+            if (Binder.getCallingPid() == OWN_PROCESS_ID) {
+                return new ArrayList<>(getUserStateLocked(resolvedUserId).mInstalledServices);
+            }
             return getUserStateLocked(resolvedUserId).mInstalledServices;
         }
     }