IVGCVSW-2291 TILE Operator CL Implementation

 * Added Tile Operator Implementation to CL
 * Added calls to the existing UnitTests
 * Added Documentation

Signed-off-by: Cian McGriskin <cian.mcgriskin@arm.com>
Change-Id: If7d25c7aa669c24e7816e5d445c7a3b9ce6972d4
diff --git a/src/backends/cl/backend.mk b/src/backends/cl/backend.mk
index 5ceab70..3499305 100644
--- a/src/backends/cl/backend.mk
+++ b/src/backends/cl/backend.mk
@@ -90,6 +90,7 @@
         workloads/ClStackWorkload.cpp \
         workloads/ClStridedSliceWorkload.cpp \
         workloads/ClSubtractionWorkload.cpp \
+        workloads/ClTileWorkload.cpp \
         workloads/ClTransposeConvolution2dWorkload.cpp \
         workloads/ClTransposeWorkload.cpp \
         workloads/ClUnidirectionalSequenceLstmFloatWorkload.cpp