Improve start-up time for winograd_filter_transform_*_nhwc

 - pass tensor's dimensions at runtime rather than compile time
 - Add guard macro to compile only kernel of internest

Resolves: COMPMID-5118
Signed-off-by: Ramy Elgammal <ramy.elgammal@arm.com>
Change-Id: Ie42c3c07fdd817ce62e7cad354381bc22c6e9264
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/7058
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Gian Marco Iodice <gianmarco.iodice@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/gpu/cl/kernels/ClWinogradFilterTransformKernel.h b/src/gpu/cl/kernels/ClWinogradFilterTransformKernel.h
index fe0c3da..b213030 100644
--- a/src/gpu/cl/kernels/ClWinogradFilterTransformKernel.h
+++ b/src/gpu/cl/kernels/ClWinogradFilterTransformKernel.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2021 Arm Limited.
+ * Copyright (c) 2018-2022 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -70,6 +70,9 @@
 
     // Inherited methods overridden:
     void run_op(ITensorPack &tensors, const Window &window, cl::CommandQueue &queue) override;
+
+private:
+    int32_t _src_dim_z{ 0 };
 };
 } // namespace kernels
 } // namespace opencl