MLCE-401 Added helpers to query backend type

Signed-off-by: Pablo Tello <pablo.tello@arm.com>
Change-Id: I6c3aa179eeaefa298e5c3a08f4d35708661615f0
diff --git a/include/armnn/BackendId.hpp b/include/armnn/BackendId.hpp
index c94cd66..5849dea 100644
--- a/include/armnn/BackendId.hpp
+++ b/include/armnn/BackendId.hpp
@@ -132,6 +132,8 @@
     }
 
     bool IsCpuRef() const { return m_Id == GetComputeDeviceAsCString(Compute::CpuRef); }
+    bool IsCpuAcc() const { return m_Id == GetComputeDeviceAsCString(Compute::CpuAcc); }
+    bool IsGpuAcc() const { return m_Id == GetComputeDeviceAsCString(Compute::GpuAcc); }
 
     const std::string& Get() const { return m_Id; }