IVGCVSW-3369 Add conversion method to HAL1.2 Policy for PReLU activation

 * Added ConvertPrelu method to HalPolicy V1.2

Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>
Change-Id: I8248d2e2bd236295845da665b2d4e687478368ef
diff --git a/1.2/HalPolicy.hpp b/1.2/HalPolicy.hpp
index 516e1eb..0966145 100644
--- a/1.2/HalPolicy.hpp
+++ b/1.2/HalPolicy.hpp
@@ -31,7 +31,8 @@
 private:
     static bool ConvertConv2d(const Operation& operation, const Model& model, ConversionData& data);
     static bool ConvertDepthwiseConv2d(const Operation& operation, const Model& model, ConversionData& data);
+    static bool ConvertPrelu(const Operation& operation, const Model& model, ConversionData& data);
 };
 
 } // namespace hal_1_2
-} // namespace armnn_driver
\ No newline at end of file
+} // namespace armnn_driver