IVGCVSW-3280 Refactor conversion methods to depend only on HalPolicy

Signed-off-by: Aron Virginas-Tar <Aron.Virginas-Tar@arm.com>
Change-Id: I162cdca922655d1bd71b18fc5d2937351f8879be
diff --git a/1.1/HalPolicy.hpp b/1.1/HalPolicy.hpp
index da0f7e4..dd8558b 100644
--- a/1.1/HalPolicy.hpp
+++ b/1.1/HalPolicy.hpp
@@ -19,6 +19,7 @@
 public:
     using Model                     = V1_1::Model;
     using Operand                   = V1_0::Operand;
+    using OperandLifeTime           = V1_0::OperandLifeTime;
     using OperandType               = V1_0::OperandType;
     using Operation                 = V1_1::Operation;
     using OperationType             = V1_1::OperationType;