Add EthosuProfiler to perform layer-by-layer profiling on Ethos-U.

Change-Id: Idae34fd8ab6b17b0bc21db658fff135a5ddf5461
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e8d46ae..ab8676e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -63,6 +63,9 @@
 # Build RTOS
 add_subdirectory(rtos)
 
+# Build libs
+add_subdirectory(lib)
+
 # Build applications
 add_subdirectory(applications)