Avoid duplicate program names

Visual Studio and CMake didn't like having targets with the same name,
albeit in different directories.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/programs/cipher/CMakeLists.txt b/programs/cipher/CMakeLists.txt
index cc16849..93e5f31 100644
--- a/programs/cipher/CMakeLists.txt
+++ b/programs/cipher/CMakeLists.txt
@@ -1,5 +1,5 @@
 set(executables
-    aead_demo
+    cipher_aead_demo
 )
 
 foreach(exe IN LISTS executables)