COMPMID-3393: Minor tweaks on memory injection interface

* Avoid the need to overload workspace() everytime
* Remove the Layer suffix from the operators
* Clean interface by removing default arguments when unsupported

Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Change-Id: I7710ecd485cae13e9c2d45216debbd8103bc5a0f
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/3610
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michalis Spyrou <michalis.spyrou@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/runtime/NEON/INEOperator.cpp b/src/runtime/NEON/INEOperator.cpp
index 3ace8a6..1d81997 100644
--- a/src/runtime/NEON/INEOperator.cpp
+++ b/src/runtime/NEON/INEOperator.cpp
@@ -49,5 +49,10 @@
 {
     ARM_COMPUTE_UNUSED(constants);
 }
+
+MemoryRequirements INEOperator::workspace() const
+{
+    return {};
+}
 } // namespace experimental
 } // namespace arm_compute