IVGCVSW-5636 'Implement NNAPI caching functions'

* Get number of inputs and outputs from optimized network.
* Get number of cached files if backend supports caching.

Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>
Change-Id: Ie02ac123bb7df9b0593a2fe46b5bb564a5994780
diff --git a/src/backends/cl/ClBackendModelContext.hpp b/src/backends/cl/ClBackendModelContext.hpp
index e7a26cd..4feb6aa 100644
--- a/src/backends/cl/ClBackendModelContext.hpp
+++ b/src/backends/cl/ClBackendModelContext.hpp
@@ -36,10 +36,13 @@
 
     bool SaveCachedNetwork() const;
 
+    int GetCachedFileDescriptor() const;
+
 private:
     std::string m_CachedNetworkFilePath;
     bool m_IsFastMathEnabled;
     bool m_SaveCachedNetwork;
+    int m_CachedFileDescriptor;
 
 };