IVGCVSW-4621 Add CL FILL Workload

* Add CL workload for Fill Operator
* Enabled Fill operator tests on CL
* CLFill function does not have validate() function yet
  IsLayerSupported() function return true at the moment
* Enabled int32 to tests on backends

Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>
Change-Id: I9f8cc6d1c86f832ba46a8d170572f4cfcde9ab17
diff --git a/src/backends/neon/test/NeonLayerTests.cpp b/src/backends/neon/test/NeonLayerTests.cpp
index c4b5d18..acadf6e 100644
--- a/src/backends/neon/test/NeonLayerTests.cpp
+++ b/src/backends/neon/test/NeonLayerTests.cpp
@@ -1224,6 +1224,7 @@
 // Fill
 ARMNN_AUTO_TEST_CASE(SimpleFill, SimpleFillTest<DataType::Float32>)
 ARMNN_AUTO_TEST_CASE(SimpleFillF16, SimpleFillTest<DataType::Float16>)
+ARMNN_AUTO_TEST_CASE(SimpleFillS32, SimpleFillTest<DataType::Signed32>)
 
 #if defined(ARMNNREF_ENABLED)