Start aconfigd socket defined in configinfra mainline module

Context: to have better future updatability. The responsiblity of
managing mainline module storage files and a socket service for flag
overrides will be moved to the configinfra mainline module. Later,
aconfigd on /system will only be repsopnsbile for managing platform
partition storage files.

Bug: b/369810972
Test: m, launch avd and then inspect the logcat log to confirm the
service is launched.

Change-Id: I490e5aa432fa4afa236689ad0999e5602f7d297e
diff --git a/rootdir/init.rc b/rootdir/init.rc
index e487797..ae6a658 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -1004,6 +1004,11 @@
     exec_start system_aconfigd_mainline_init
     start system_aconfigd_socket_service
 
+    # start mainline aconfigd init, after transition, the above system_aconfigd_mainline_init
+    # will be deprecated
+    exec_start mainline_aconfigd_init
+    start mainline_aconfigd_socket_service
+
     # Create directories for boot animation.
     mkdir /data/misc/bootanim 0755 system system