Add negative testing support for ew_unary operators

 * Added negative testing support for the following operators:
abs, bitwise_not, ceil, clz, exp, floor, log, logical_not, negate, reciprocal, rsqrt

Change-Id: Icc6f146c6407502520330678420951749ba2a9ef
Signed-off-by: Matthew Haddon <matthew.haddon@arm.com>
diff --git a/verif/tosa_error_if.py b/verif/tosa_error_if.py
index c28591d..6656645 100644
--- a/verif/tosa_error_if.py
+++ b/verif/tosa_error_if.py
@@ -30,4 +30,6 @@
     BatchMismatch = "BatchMismatch"
     ChannelMismatch = "ChannelMismatch"
     RankMismatch = "RankMismatch"
+    InputZeroPointNotZero = "InputZeroPointNotZero"
+    OutputZeroPointNotZero = "OutputZeroPointNotZero"