support/tests: enable PPD, and thus TLPB, for systemd tests

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/init/test_systemd.py

@@ -13,6 +13,7 @@ class InitSystemSystemdBase(InitSystemBase):
         BR2_INIT_SYSTEMD=y
         BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
         # BR2_TARGET_ROOTFS_TAR is not set
+        BR2_PER_PACKAGE_DIRECTORIES=y
         """
 
     def check_systemd(self, fs):