cactus: update build options and memory map to make it PIE

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I9287361d2a4c81954fae715fef6ba5cc57cc10e0
diff --git a/spm/cactus/cactus_def.h b/spm/cactus/cactus_def.h
index 13b5dac..e865036 100644
--- a/spm/cactus/cactus_def.h
+++ b/spm/cactus/cactus_def.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, Arm Limited. All rights reserved.
+ * Copyright (c) 2018-2020, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -14,7 +14,7 @@
  */
 
 /* Up to 2 MiB at an arbitrary address that doesn't overlap the devices. */
-#define CACTUS_IMAGE_BASE		ULL(0x80000000)
+#define CACTUS_IMAGE_BASE		ULL(0x1000)
 #define CACTUS_IMAGE_SIZE		ULL(0x200000)
 
 /* Memory reserved for stacks */