COMPMID-417: Match tolerance for CL and NEON in Normalization layer.

Change-Id: I755d8b5c27724d971b7c52c1df5adbf513154e50
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/88064
Reviewed-by: Steven Niu <steven.niu@arm.com>
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
diff --git a/tests/validation/CL/NormalizationLayer.cpp b/tests/validation/CL/NormalizationLayer.cpp
index 35f7f72..1a029cf 100644
--- a/tests/validation/CL/NormalizationLayer.cpp
+++ b/tests/validation/CL/NormalizationLayer.cpp
@@ -50,7 +50,7 @@
 
 /** Tolerance for fixed point operations */
 constexpr AbsoluteTolerance<int8_t>  tolerance_qs8(2);
-constexpr AbsoluteTolerance<int16_t> tolerance_qs16(2);
+constexpr AbsoluteTolerance<int16_t> tolerance_qs16(3);
 
 /** Input data set. */
 const auto NormalizationDataset = combine(combine(combine(datasets::SmallShapes(), framework::dataset::make("NormType", { NormType::IN_MAP_1D, NormType::CROSS_MAP })),