start aconfig storage daemon

Bug: b/312444587
Test: m and launch AVD
Change-Id: I92946fc4ec2100d995300c58ef6045ae5b40f13a
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 164d411..2b29e7d 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -644,6 +644,7 @@
     mkdir /metadata/aconfig 0775 root system
     mkdir /metadata/aconfig/flags 0770 root system
     mkdir /metadata/aconfig/boot 0775 root system
+    exec_start aconfigd
 
 on late-fs
     # Ensure that tracefs has the correct permissions.