Add tf_fuzz tool

This is fully derived from tf-m repo.

Signed-off-by: Karl Zhang <karl.zhang@arm.com>
Change-Id: I8d35e70eda9081af66d8fa3f3cb4beb1d953060e
diff --git a/tf_fuzz/demo/28 b/tf_fuzz/demo/28
new file mode 100644
index 0000000..e9fd0d8
--- /dev/null
+++ b/tf_fuzz/demo/28
@@ -0,0 +1,4 @@
+purpose to create a key, then read the key data ("material") into a variable;
+set policy name somePolicy alg sha3_224 attr noexport volatile;
+set key name aKey data * policy somePolicy;
+read key name aKey var keyDataVar;