IVGCVSW-7623: GpuFsa Op: Add Pool2d operator

* Add Pool2d EndToEnd tests to all backends
* Add utility functions for the attributes in a separate file
* Remove some unnecessary includes

Signed-off-by: Teresa Charlin <teresa.charlinreyes@arm.com>
Change-Id: I0f82ebbf7b3301c6368462fb4fb4d4d02b246fc6
diff --git a/src/backends/gpuFsa/layers/GpuFsaPooling2d.hpp b/src/backends/gpuFsa/layers/GpuFsaPooling2d.hpp
new file mode 100644
index 0000000..25f6e72
--- /dev/null
+++ b/src/backends/gpuFsa/layers/GpuFsaPooling2d.hpp
@@ -0,0 +1,20 @@
+//
+// Copyright © 2024 Arm Ltd and Contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+#pragma once
+
+#include <armnn/Descriptors.hpp>
+
+#include <gpuFsa/GpuFsaBackend.hpp>
+
+namespace armnn
+{
+arm_compute::Status GpuFsaPooling2dValidate(const TensorInfo& input,
+                                            const Pooling2dDescriptor& descriptor);
+
+void GpuFsaPooling2dCreateOp(GpuFsaPreCompiledBlob* blob,
+                             const TensorInfo& input,
+                             const Pooling2dDescriptor& descriptor);
+
+} // namespace armnn
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