Main Compliance testing support for EXP & POW

Added new ABS_ERROR mode to verify lib and ref model.

Signed-off-by: Jeremy Johnson <jeremy.johnson@arm.com>
Change-Id: Ifb78290675833d3df7df91a4d6cef336b02b64a4
diff --git a/verif/generator/tosa_utils.py b/verif/generator/tosa_utils.py
index 3b487de..318f296 100644
--- a/verif/generator/tosa_utils.py
+++ b/verif/generator/tosa_utils.py
@@ -38,6 +38,7 @@
     ULP = 2
     FP_SPECIAL = 3
     REDUCE_PRODUCT = 4
+    ABS_ERROR = 5
 
 
 class DataGenType(IntEnum):