COMPMID-1246 Increase tolerance in CLArithmeticDivision for FP16

Also change the random distribution range to not include values
close to zero which will produce inf.

Change-Id: I75f72c57b5cc66b4b305501b7f9c6a63c6cc30eb
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/136351
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Reviewed-by: Pablo Tello <pablo.tello@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
diff --git a/tests/validation/CL/ArithmeticDivision.cpp b/tests/validation/CL/ArithmeticDivision.cpp
index dab3f75..42e2d22 100644
--- a/tests/validation/CL/ArithmeticDivision.cpp
+++ b/tests/validation/CL/ArithmeticDivision.cpp
@@ -44,7 +44,7 @@
 namespace
 {
 RelativeTolerance<float> tolerance_fp32(0.000001f);
-RelativeTolerance<float> tolerance_fp16(0.0001f);
+RelativeTolerance<float> tolerance_fp16(0.001f);
 } // namespace
 
 TEST_SUITE(CL)