Create a partial META/ subdir in soong target_files.zip

This CL adds the following files to META/
- update_engine_config.txt
- zucchini_config.txt
- liblz4.so

Bug: 388633394
Test: Built the target_files.zip locally and diffed META/ subdir between
make and soong

Change-Id: Iad635e1382362929beecbc1c9d89e314eddcc90f
diff --git a/fsgen/filesystem_creator.go b/fsgen/filesystem_creator.go
index fbe9078..fa871ec 100644
--- a/fsgen/filesystem_creator.go
+++ b/fsgen/filesystem_creator.go
@@ -264,7 +264,8 @@
 	partitionProps.Vbmeta_partitions = vbmetaPartitions
 
 	deviceProps := &filesystem.DeviceProperties{
-		Main_device: proptools.BoolPtr(true),
+		Main_device:    proptools.BoolPtr(true),
+		Ab_ota_updater: proptools.BoolPtr(ctx.Config().ProductVariables().PartitionVarsForSoongMigrationOnlyDoNotUse.AbOtaUpdater),
 	}
 	if bootloader, ok := f.createBootloaderFilegroup(ctx); ok {
 		deviceProps.Bootloader = proptools.StringPtr(":" + bootloader)