COMPMID-423: Port CLSoftmaxLayer to QS8

Change-Id: I759b7585656d018d7c864425118cd3ec2ca9b0eb
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/78908
Reviewed-by: Michele DiGiorgio <michele.digiorgio@arm.com>
Reviewed-by: Moritz Pflanzer <moritz.pflanzer@arm.com>
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
diff --git a/tests/validation/NEON/SoftmaxLayer.cpp b/tests/validation/NEON/SoftmaxLayer.cpp
index 519cac3..66a9e03 100644
--- a/tests/validation/NEON/SoftmaxLayer.cpp
+++ b/tests/validation/NEON/SoftmaxLayer.cpp
@@ -83,7 +83,7 @@
     // Fill tensors
     if(arm_compute::is_data_type_float(dt))
     {
-        std::uniform_real_distribution<> distribution(-10, 10);
+        std::uniform_real_distribution<> distribution(-1000.f, 1000.f);
         library->fill(NEAccessor(src), distribution, 0);
     }
     else