IVGCVSW-2386 Work around Compute Library Arm v7 issue

per COMPMID-1818 change to using Blob-based memory manager.
Will change back when COMPMID-1848 is fixed.

Change-Id: I6e22c2edf422202410faa717b330a2c96c3ebbe5
diff --git a/src/backends/neon/NeonBackend.cpp b/src/backends/neon/NeonBackend.cpp
index cde2998..fd2b766 100644
--- a/src/backends/neon/NeonBackend.cpp
+++ b/src/backends/neon/NeonBackend.cpp
@@ -48,7 +48,7 @@
 IBackendInternal::IMemoryManagerUniquePtr NeonBackend::CreateMemoryManager() const
 {
     return std::make_unique<NeonMemoryManager>(std::make_unique<arm_compute::Allocator>(),
-                                               BaseMemoryManager::MemoryAffinity::Offset);
+                                               BaseMemoryManager::MemoryAffinity::Buffer);
 }
 
 IBackendInternal::IWorkloadFactoryPtr NeonBackend::CreateWorkloadFactory(
@@ -74,4 +74,4 @@
     return layerSupport;
 }
 
-} // namespace armnn
\ No newline at end of file
+} // namespace armnn