Add Subtraction operator to Dynamic Fusion interface

Partially-Resolves: COMPMID-5518

Change-Id: I8358784815bcac461d50e384fa7bc96f476d3983
Signed-off-by: Ramy Elgammal <ramy.elgammal@arm.com>
Signed-off-by: Jakub Sujak <jakub.sujak@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/9045
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Viet-Hoa Do <viet-hoa.do@arm.com>
Reviewed-by: SiCong Li <sicong.li@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Dynamic-Fusion: SiCong Li <sicong.li@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>
diff --git a/tests/validation/CL/ArithmeticAddition.cpp b/tests/validation/CL/ArithmeticAddition.cpp
index 45632dc..1ed3a10 100644
--- a/tests/validation/CL/ArithmeticAddition.cpp
+++ b/tests/validation/CL/ArithmeticAddition.cpp
@@ -41,6 +41,9 @@
 {
 namespace validation
 {
+/** Synced with tests/validation/dynamic_fusion/gpu/cl/Add.cpp from the dynamic fusion interface.
+ * Please check there for any differences in the coverage
+ */
 namespace
 {
 /** Input data sets **/