IVGCVSW-5382 TfLiteDelegate: Implement the Activation operators

 * Added TfLiteDelegate implementations for ReLu, Relu6, Logistic, and TanH
Activation Functions

Signed-off-by: David Monahan <david.monahan@arm.com>
Change-Id: Id021b4ec9c10fd4357535fe2a665f32c053dad61
diff --git a/delegate/CMakeLists.txt b/delegate/CMakeLists.txt
index 1ea0cdd..3c77dcf 100644
--- a/delegate/CMakeLists.txt
+++ b/delegate/CMakeLists.txt
@@ -104,6 +104,8 @@
 if(BUILD_UNIT_TESTS)
     set(armnnDelegate_unittest_sources)
     list(APPEND armnnDelegate_unittest_sources
+        src/test/ActivationTest.cpp
+        src/test/ActivationTestHelper.hpp
         src/test/ArmnnDelegateTest.cpp
         src/test/ComparisonTest.cpp
         src/test/ComparisonTestHelper.hpp