Enable exception handlers by default in tests.

This will give more useful error messages when tests fail due to
memory faults or other EL1 exceptions.

Bug: 143755046
Change-Id: I5833ab65ac7d44f69118eb004f03cdcedc365874
diff --git a/test/hftest/standalone_main.c b/test/hftest/standalone_main.c
index 63edf1e..f42c71b 100644
--- a/test/hftest/standalone_main.c
+++ b/test/hftest/standalone_main.c
@@ -17,6 +17,8 @@
 #include <stdalign.h>
 #include <stdint.h>
 
+#include "hf/arch/vm/interrupts.h"
+
 #include "hf/fdt.h"
 #include "hf/memiter.h"
 #include "hf/mm.h"
@@ -45,6 +47,12 @@
 		return;
 	}
 
+	/*
+	 * Install the exception handler with no IRQ callback for now, so that
+	 * exceptions are logged.
+	 */
+	exception_setup(NULL);
+
 	hftest_use_list(hftest_begin, hftest_end - hftest_begin);
 
 	if (!fdt_root_node(&n, fdt)) {