IVGCVSW-5654 Fix failing float 16 delegate tests on android

 * add template specialization declaration to header to resolve clang issue

Signed-off-by: Finn Williams <Finn.Williams@arm.com>
Change-Id: Id8104d6feda19ed3f5f0cb018d719b1677772d9b
diff --git a/delegate/src/test/TestUtils.hpp b/delegate/src/test/TestUtils.hpp
index ad7600d..d14e1ed 100644
--- a/delegate/src/test/TestUtils.hpp
+++ b/delegate/src/test/TestUtils.hpp
@@ -30,6 +30,9 @@
     }
 }
 
+template <>
+void FillInput(std::unique_ptr<tflite::Interpreter>& interpreter, int inputIndex, std::vector<Half>& inputValues);
+
 /// Can be used to compare bool data coming from a tflite interpreter
 /// Boolean types get converted to a bit representation in a vector. vector.data() returns a void pointer
 /// instead of a pointer to bool. Therefore a special function to compare to vector of bool is required