IVGCVSW-2745 Unit test error running ArmNN on Raspberry Pi

 * Fix bad_alloc on NeonTimerMeasure test

Change-Id: Ia4ab24abfe0305a3d7773162dc423bc049e1a3cc
Signed-off-by: Conor Kennedy <conor.kennedy@arm.com>
diff --git a/src/backends/neon/test/NeonTimerTest.cpp b/src/backends/neon/test/NeonTimerTest.cpp
index d2d4460..61f162a 100644
--- a/src/backends/neon/test/NeonTimerTest.cpp
+++ b/src/backends/neon/test/NeonTimerTest.cpp
@@ -40,8 +40,8 @@
     NeonWorkloadFactory workloadFactory =
         NeonWorkloadFactoryHelper::GetFactory(NeonWorkloadFactoryHelper::GetMemoryManager());
 
-    unsigned int inputWidth = 4000u;
-    unsigned int inputHeight = 5000u;
+    unsigned int inputWidth = 2000u;
+    unsigned int inputHeight = 2000u;
     unsigned int inputChannels = 1u;
     unsigned int inputBatchSize = 1u;