COMPMID-630 : Rework nodes for selective target compilation.

Reworked nodes:
-ActivationLayer

Change-Id: Iaa394531ef208db48caa2c18a41ad9a845471f94
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/92281
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/SConscript b/SConscript
index 195eff1..4a351ff 100644
--- a/SConscript
+++ b/SConscript
@@ -204,6 +204,9 @@
     graph_files = Glob('src/graph/*.cpp')
     graph_files += Glob('src/graph/nodes/*.cpp')
 
+    graph_files += Glob('src/graph/operations/CL/*.cpp')
+    graph_files += Glob('src/graph/operations/NEON/*.cpp')
+
     graph_files += Glob('src/graph/CL/*.cpp')
     graph_files += Glob('src/graph/NEON/*.cpp')