Add android.os.flagging.AconfigPackage in preload list

It saves time for loading AconfigPackage and find right containers for each process using exported aconfig flag.

Test: presubmit
Bug: 349874828
Change-Id: I176aaf3164d9134b57659728b40e4f0e3684a52e
diff --git a/config/preloaded-classes b/config/preloaded-classes
index ed40276..343de0b 100644
--- a/config/preloaded-classes
+++ b/config/preloaded-classes
@@ -6473,6 +6473,7 @@
 android.os.connectivity.WifiActivityEnergyInfo
 android.os.connectivity.WifiBatteryStats$1
 android.os.connectivity.WifiBatteryStats
+android.os.flagging.AconfigPackage
 android.os.health.HealthKeys$Constant
 android.os.health.HealthKeys$Constants
 android.os.health.HealthKeys$SortedIntArray