SST: Remove ENABLE_SECURE_STORAGE flag

This patch removes the ENABLE_SECURE_STORAGE as the current TF-M
design does not provide a mechanism to disable services.

Change-Id: Icaa64333da9561317d8cda5e89464477e15d003d
Signed-off-by: Marc Moreno <marc.morenoberengue@arm.com>
diff --git a/CommonConfig.cmake b/CommonConfig.cmake
index e249af4..3aaca75 100644
--- a/CommonConfig.cmake
+++ b/CommonConfig.cmake
@@ -205,31 +205,27 @@
 #Default TF-M secure storage flags.
 #These flags values can be overwritten by setting them in platform/ext/<TARGET_NAME>.cmake
 #Documentation about these flags can be found in docs/user_guides/services/tfm_sst_integration_guide.md
-if (NOT DEFINED ENABLE_SECURE_STORAGE)
-	set (ENABLE_SECURE_STORAGE ON)
+if (NOT DEFINED SST_ENCRYPTION)
+	set (SST_ENCRYPTION ON)
+endif()
 
-	if (NOT DEFINED SST_ENCRYPTION)
-		set (SST_ENCRYPTION ON)
-	endif()
+if (NOT DEFINED SST_ROLLBACK_PROTECTION)
+	set (SST_ROLLBACK_PROTECTION OFF)
+endif()
 
-	if (NOT DEFINED SST_ROLLBACK_PROTECTION)
-		set (SST_ROLLBACK_PROTECTION OFF)
-	endif()
+if (NOT DEFINED SST_CREATE_FLASH_LAYOUT)
+	set (SST_CREATE_FLASH_LAYOUT OFF)
+endif()
 
-	if (NOT DEFINED SST_CREATE_FLASH_LAYOUT)
-		set (SST_CREATE_FLASH_LAYOUT OFF)
-	endif()
+if (NOT DEFINED SST_VALIDATE_METADATA_FROM_FLASH)
+	set (SST_VALIDATE_METADATA_FROM_FLASH ON)
+endif()
 
-	if (NOT DEFINED SST_VALIDATE_METADATA_FROM_FLASH)
-		set (SST_VALIDATE_METADATA_FROM_FLASH ON)
-	endif()
-
-	if (NOT DEFINED SST_RAM_FS)
-		if (REGRESSION)
-			set (SST_RAM_FS ON)
-		else()
-			set (SST_RAM_FS OFF)
-		endif()
+if (NOT DEFINED SST_RAM_FS)
+	if (REGRESSION)
+		set (SST_RAM_FS ON)
+	else()
+		set (SST_RAM_FS OFF)
 	endif()
 endif()