AK3: add system_dlkm.img flashing to write_boot function

META-INF/com/google/android/updater-script

@@ -3,4 +3,4 @@
 # Dummy file; update-binary is a shell script (DO NOT CHANGE)
 #
 #
-# AK_BASE_VERSION=20231018
+# AK_BASE_VERSION=20231020

tools/ak3-core.sh

@@ -570,6 +570,7 @@ write_boot() {
   flash_generic vendor_boot; # temporary until hdr v4 can be unpacked/repacked fully by magiskboot
   flash_generic vendor_kernel_boot; # temporary until hdr v4 can be unpacked/repacked fully by magiskboot
   flash_generic vendor_dlkm;
+  flash_generic system_dlkm;
   flash_generic dtbo;
 }
 ###