secure_storage: add dependency for Settings backend

Secure Storage is used as PSA ITS in builds where TF-M is not enabled,
but it needs a storage backend where to physically save data.
If CONFIG_SECURE_STORAGE_ITS_STORE_IMPLEMENTATION_ZMS is used then its
"depends on" guarantee that there is a partition to use as physical
storage.
If CONFIG_SECURE_STORAGE_ITS_STORE_IMPLEMENTATION_SETTINGS is used instead
we want to ensure that CONFIG_SETTINGS_NONE doesn't gets selected which
would result in Settings not being able to store data anywhere.

This commit add a depends_on for this last case.

Signed-off-by: Valerio Setti <[email protected]>

Author: valeriosetti

subsys/secure_storage/Kconfig.its_store

@@ -31,7 +31,7 @@ config SECURE_STORAGE_ITS_STORE_IMPLEMENTATION_SETTINGS
 	     && $(dt_node_has_compat,$(dt_node_parent,$(DT_SETTINGS_PARTITIION)),fixed-partitions))\
 	  || ($(dt_path_enabled,$(DT_STORAGE_PARTITION)) \
 	      && $(dt_node_has_compat,$(dt_node_parent,$(DT_STORAGE_PARTITION)),fixed-partitions)))
-	depends on SETTINGS
+	depends on SETTINGS && !SETTINGS_NONE
 
 config SECURE_STORAGE_ITS_STORE_IMPLEMENTATION_NONE
 	bool "No ITS store module implementation"