Fix incrementality issues for vendor_boot_filesystem_config.txt

Similar to the issue described in https://r.android.com/3524966,
vendor_boot_filesystem_config.txt runs into incrementality issues since
the fs_config call is in a separate rule from the rule which assembles
VENDOR_BOOT/RAMDISK.

This CL fixes this by inlining the fs_config cmd in the rule that builds
target_files.zip

Test: In a clean build, diffed vendor_boot_filesystem_config.txt between
make and soong

Change-Id: Ide86b81b7b97316eb2dee56b0e3658ad84b1bc6e
diff --git a/filesystem/android_device.go b/filesystem/android_device.go
index a616ee0..7387c8a 100644
--- a/filesystem/android_device.go
+++ b/filesystem/android_device.go
@@ -673,7 +673,13 @@
 		}
 		if partition == "vendor_ramdisk" {
 			// Create vendor_boot_filesystem_config from the assembled VENDOR_BOOT/RAMDISK intermediates directory
-			a.generateFilesystemConfigForTargetFiles(ctx, builder, nil, targetFilesDir.String(), targetFilesDir.String()+"/VENDOR_BOOT/RAMDISK", "vendor_boot_filesystem_config.txt")
+			vendorRamdiskStagingDir := targetFilesDir.String() + "/VENDOR_BOOT/RAMDISK"
+			vendorRamdiskFsConfigOut := targetFilesDir.String() + "/META/vendor_boot_filesystem_config.txt"
+			fsConfigBin := ctx.Config().HostToolPath(ctx, "fs_config")
+			builder.Command().Textf(
+				`(cd %s; find . -type d | sed 's,$,/,'; find . \! -type d) | cut -c 3- | sort | sed 's,^,,' | %s -C -D %s -R \"\" > %s`,
+				vendorRamdiskStagingDir, fsConfigBin, vendorRamdiskStagingDir, vendorRamdiskFsConfigOut).
+				Implicit(fsConfigBin)
 		}
 	}
 	// Copy ramdisk_node_list