COMPMID-1478: Stop relying on static default OpenCL objects in cl2.hpp

This causes problems when ACL is used as a shared library on Android.
Fixes some problems related to creation / destruction order between the Graph's CL backend and core / runtime

Change-Id: I716d63fd42f4586df1ffbb6fa97e4db06d3a781b
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/143228
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele DiGiorgio <michele.digiorgio@arm.com>
Reviewed-by: Gian Marco Iodice <gianmarco.iodice@arm.com>
diff --git a/src/core/CL/kernels/CLDirectConvolutionLayerKernel.cpp b/src/core/CL/kernels/CLDirectConvolutionLayerKernel.cpp
index 754f0d8..6de97d4 100644
--- a/src/core/CL/kernels/CLDirectConvolutionLayerKernel.cpp
+++ b/src/core/CL/kernels/CLDirectConvolutionLayerKernel.cpp
@@ -442,7 +442,7 @@
     // Configure kernel window
     auto win_config = validate_and_configure_window(input->info(), weights->info(), output->info(), conv_info, gpu_target);
     ARM_COMPUTE_ERROR_THROW_ON(win_config.first);
-    ICLKernel::configure(win_config.second);
+    ICLKernel::configure_internal(win_config.second);
 
     // Set static kernel arguments
     if(is_data_type_quantized_asymmetric(data_type))
@@ -532,7 +532,7 @@
         unsigned int idx = 0;
         add_3D_tensor_argument(idx, _input, slice_in);
         add_3D_tensor_argument(idx, _output, slice);
-        enqueue(queue, *this, slice, _lws_hint);
+        enqueue(queue, *this, slice, lws_hint());
     }
     while(window.slide_window_slice_3D(slice) && win_in.slide_window_slice_3D(slice_in));
 }