Add trustzone application example

Add example project that builds both secure and nonsecure world
sides and the inference is done on the secure side.
This commit includes the mpc driver as found in the upstream
trustedfirmware git repository
https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git
(8c0a234e453b51e6606d11599d0cb15097c3da48)

The model,input and output used are described in the README.md in this
directory.

Change-Id: Ie54904a38d54df4de2d6936f066c388ea58e396b
diff --git a/applications/CMakeLists.txt b/applications/CMakeLists.txt
index e014136..178fc53 100644
--- a/applications/CMakeLists.txt
+++ b/applications/CMakeLists.txt
@@ -17,3 +17,8 @@
 #
 
 add_subdirectory(freertos)
+
+if (CMAKE_CXX_COMPILER_ID STREQUAL "ARMClang")
+    # Only armclang supported for now
+    add_subdirectory(trustzone_inference)
+endif()