Revert "[nrf noup] tests: secure_storage: fix test w/ ZMS backend on 54L15"

This reverts commit ff0b9ad.

Signed-off-by: Tomi Fontanilles <[email protected]>

Author: tomi-font

tests/subsys/secure_storage/psa/its/testcase.yaml

@@ -28,7 +28,6 @@ tests:
     extra_args:
       - EXTRA_DTC_OVERLAY_FILE=zms.overlay
       - EXTRA_CONF_FILE=overlay-secure_storage.conf;overlay-store_zms.conf;overlay-transform_default.conf
-      - SB_CONFIG_PARTITION_MANAGER=n
 
   secure_storage.psa.its.secure_storage.store.settings:
     filter: CONFIG_SECURE_STORAGE_ITS_STORE_IMPLEMENTATION_SETTINGS