IVGCVSW-6061 Add PRELU support to TF Lite delegate

* Alpha is supported both as a constant and as an
  input tensor.

Signed-off-by: James Conroy <james.conroy@arm.com>
Change-Id: I20f30d479b87dc5fbcf75a1ce5305d70ae9b0646
diff --git a/delegate/CMakeLists.txt b/delegate/CMakeLists.txt
index 84c4158..c7ac439 100644
--- a/delegate/CMakeLists.txt
+++ b/delegate/CMakeLists.txt
@@ -36,6 +36,7 @@
         src/Pack.hpp
         src/Pad.hpp
         src/Pooling.hpp
+        src/Prelu.hpp
         src/Quantization.hpp
         src/Redefine.hpp
         src/Reduce.hpp
@@ -153,6 +154,8 @@
         src/test/PadTestHelper.hpp
         src/test/Pooling2dTest.cpp
         src/test/Pooling2dTestHelper.hpp
+        src/test/PreluTest.cpp
+        src/test/PreluTestHelper.hpp
         src/test/QuantizationTest.cpp
         src/test/QuantizationTestHelper.hpp
         src/test/RedefineTestHelper.hpp