Test: Fix inconsistency of IPC test config flag

The IPC test suites have different config flags for NS and S.
They should have the same.

This patch fixes this issue.

Change-Id: I862e380bfea3fa667df148cd83a6994ec26531a6
Signed-off-by: Kevin Peng <kevin.peng@arm.com>
diff --git a/test/framework/secure_suites.c b/test/framework/secure_suites.c
index 2e2eb17..a572e05 100644
--- a/test/framework/secure_suites.c
+++ b/test/framework/secure_suites.c
@@ -70,7 +70,7 @@
     {&register_testsuite_s_audit_interface, 0, 0, 0},
 #endif
 
-#ifdef ENABLE_IPC_TEST
+#ifdef TFM_PSA_API
     /* Secure IPC test cases */
     {&register_testsuite_s_ipc_interface, 0, 0, 0},
 #endif