Fix systemd and rauc dependencies

These packages attempt to manipulate directories/files created by RAUC
and systemd, so let's ensure that they are built in a correct order.

Change-Id: Id51b873bb31a1771d11dc0c13f0208da972dd13f
diff --git a/package/czechlight-rauc/Config.in b/package/czechlight-rauc/Config.in
index 71ef0da..be40aba 100644
--- a/package/czechlight-rauc/Config.in
+++ b/package/czechlight-rauc/Config.in
@@ -1,5 +1,7 @@
 config CZECHLIGHT_RAUC_ROOTFS
 	bool "Create RAUC update bundle"
+	depends on BR2_INIT_SYSTEMD
+	depends on BR2_PACKAGE_RAUC
 	select BR2_PACKAGE_CZECHLIGHT_CFG_FS
 	select BR2_PACKAGE_HOST_RAUC
 	select BR2_PACKAGE_CZECHLIGHT_RAUC