Start aconfigd_system processes in init.rc

aconfigd_system is replacing aconfigd. Which one executes is toggled
by RO flag enable_system_aconfigd_rust, introduced in https://android-review.googlesource.com/q/topic:%22switch-to-aconfigd-system%22.

Bug: 378079539
Test: m
Change-Id: I6a04c38e9ef22da2b230046ddace73d6f7e39652
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 5bb64cc..617e60a 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -614,6 +614,9 @@
     mkdir /metadata/aconfig/boot 0775 root system
 
     mkdir /metadata/aconfig_test_missions 0775 root system
+
+    # See flag enable_system_aconfigd_rust, which toggles these processes.
+    exec_start system_aconfigd_platform_init
     exec_start aconfigd-platform-init
 
 on late-fs
@@ -1002,7 +1005,16 @@
     # Wait for apexd to finish activating APEXes before starting more processes.
     wait_for_prop apexd.status activated
     perform_apex_config
+
+    # See flag enable_system_aconfigd_rust, which toggles these processes.
     exec_start aconfigd-mainline-init
+    exec_start system_aconfigd_mainline_init
+
+    # system_aconfigd_socket_service is replacing aconfigd:
+    #   - A flag (enable_system_aconfigd_rust) toggles which socket executes.
+    #   - When enabled, aconfigd is a no-op, system_aconfigd_socket_service executes.
+    #   - Conversely, when disabled, aconfigd executes, and system_aconfigd_socket_service is a no-op.
+    start system_aconfigd_socket_service
     start aconfigd
 
     # Create directories for boot animation.