Test: Add positive test suite to IPC build config

This patch adds support for positive core test suite under IPC mode.
Auto signal generation still not implemented that's why
tfm_ss_core_test*_signal.h files are created manually.

Details:
 * enable CORE_TEST in ConfigCoreIPC.cmake
 * implement secure function calls using the PSA API in test services
   and in the test suite
 * define signals for test services
 * update partition manifest files for test services to enumerate the
   available secure functions

Change-Id: I7cbb0acaabbed7cd44650c6a2f9ff3c632e05500
Signed-off-by: Mate Toth-Pal <mate.toth-pal@arm.com>
diff --git a/ConfigCoreIPC.cmake b/ConfigCoreIPC.cmake
index 545fd49..b87a834 100644
--- a/ConfigCoreIPC.cmake
+++ b/ConfigCoreIPC.cmake
@@ -27,7 +27,7 @@
 #various project specific settings (e.g. what files to build, macro
 #definitions) based on these.
 set (REGRESSION False)
-set (CORE_TEST False)
+set (CORE_TEST True)
 set (CORE_IPC True)
 
 # TF-M isolation level: 1..3