test(spm): check processor feature regs

For cactus secure partitions, check ID registers report:
-FPU/Adv. SIMD supported.
-SVE/SME not supported.

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: Iba3508d57a8bcb1f554adddef97c4c83f4118a03
diff --git a/spm/cactus/cactus_main.c b/spm/cactus/cactus_main.c
index b39f138..1d5cd97 100644
--- a/spm/cactus/cactus_main.c
+++ b/spm/cactus/cactus_main.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2023, Arm Limited. All rights reserved.
+ * Copyright (c) 2018-2024, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -327,8 +327,9 @@
 	discover_managed_exit_interrupt_id();
 	register_maintenance_interrupt_handlers();
 
-	/* Invoking Tests */
+	/* Invoking self tests */
 	ffa_tests(&mb);
+	cpu_feature_tests();
 
 msg_loop:
 	/* End up to message loop */