FIH: Add fault injection hardening library

Signed-off-by: Tamas Ban <tamas.ban@arm.com>
Signed-off-by: Raef Coles <raef.coles@arm.com>
Co-authored-by: David Hu <david.hu@arm.com>
Change-Id: I188c2739a525a5d1b2aed43fd1c16063aa697297
diff --git a/CMakeLists.txt b/CMakeLists.txt
index fc9605e..b204c74 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 #-------------------------------------------------------------------------------
-# Copyright (c) 2020, Arm Limited. All rights reserved.
+# Copyright (c) 2020-2021, Arm Limited. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -82,6 +82,7 @@
 ################################################################################
 
 add_subdirectory(lib/ext)
+add_subdirectory(lib/fih)
 add_subdirectory(tools)
 add_subdirectory(docs)
 if(NS)