COMPMID-446: Add support for QS8/QS16 CL Arithmetic Add/Sub

Change-Id: I84fc457a9c28856a11322944822d2fabaf92e8e4
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/80528
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Moritz Pflanzer <moritz.pflanzer@arm.com>
9 files changed