IVGCVSW-1946: Remove armnn/src from the include paths

Change-Id: I663a0a0fccb43ee960ec070121a59df9db0bb04e
diff --git a/src/backends/neon/CMakeLists.txt b/src/backends/neon/CMakeLists.txt
index b5e6ff3..0f7759d 100644
--- a/src/backends/neon/CMakeLists.txt
+++ b/src/backends/neon/CMakeLists.txt
@@ -30,7 +30,7 @@
 endif()
 
 add_library(armnnNeonBackend OBJECT ${armnnNeonBackend_sources})
-target_include_directories(armnnNeonBackend PRIVATE ${PROJECT_SOURCE_DIR}/src)
 target_include_directories(armnnNeonBackend PRIVATE ${PROJECT_SOURCE_DIR}/src/armnn)
 target_include_directories(armnnNeonBackend PRIVATE ${PROJECT_SOURCE_DIR}/src/armnnUtils)
+target_include_directories(armnnNeonBackend PRIVATE ${PROJECT_SOURCE_DIR}/src/backends)