COMPMID-417: Remove 8 batches for CL VGG convolution layer

Change-Id: Ib93d5515d64e26f0dc8acc65fbfdf80958b6ee2e
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/87253
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
diff --git a/tests/benchmark/CL/ConvolutionLayer.cpp b/tests/benchmark/CL/ConvolutionLayer.cpp
index 122e19b..620feaf 100644
--- a/tests/benchmark/CL/ConvolutionLayer.cpp
+++ b/tests/benchmark/CL/ConvolutionLayer.cpp
@@ -103,10 +103,11 @@
                                                                                         data_types),
                                                             framework::dataset::make("Batches", { 4, 8 })));
 
+// 8 batches use about 1.8GB of memory which is too much for most devices!
 REGISTER_FIXTURE_DATA_TEST_CASE(VGG16ConvolutionLayer, CLConvolutionLayerFixture, framework::DatasetMode::NIGHTLY,
                                 framework::dataset::combine(framework::dataset::combine(datasets::VGG16ConvolutionLayerDataset(),
                                                                                         data_types),
-                                                            framework::dataset::make("Batches", { 1, 4, 8 })));
+                                                            framework::dataset::make("Batches", { 1, 4 })));
 
 REGISTER_FIXTURE_DATA_TEST_CASE(YOLOV2ConvolutionLayer, CLConvolutionLayerFixture, framework::DatasetMode::NIGHTLY,
                                 framework::dataset::combine(framework::dataset::combine(datasets::YOLOV2ConvolutionLayerDataset(),