Cactus: decouple exception handling from tftf framework

So far, tftf framework's exception handling was used for Cactus
exceptions also. With new interrupt related tests coming up in
Cactus, we need a separate exception handler code for Cactus.

This patch enables irq/fiq for Cactus and adds placeholder handlers
for them.

Change-Id: Ifd89c4ba8b4491345948bf342540b37fdbc91b8d
Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/spm/cactus/cactus_main.c b/spm/cactus/cactus_main.c
index ed48fe4..8cd57e7 100644
--- a/spm/cactus/cactus_main.c
+++ b/spm/cactus/cactus_main.c
@@ -197,6 +197,10 @@
 
 	enable_mmu_el1(0);
 
+	/* Enable IRQ/FIQ */
+	enable_irq();
+	enable_fiq();
+
 	if (primary_cold_boot == false) {
 		goto msg_loop;
 	}