COMPMID-746 Allow NEDirectConvolution to work without biases for QS.

Renamed BiasAccumulateKernel to OutputStage. If no bias is provided
when the input is quantized, the kernel simply downscales the input.
Throw error if no bias is provided and input is floating point.

Change-Id: I645a4ee9c6014b0547778fdd92c9ec72ef2f0aab
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/114158
Reviewed-by: Gian Marco Iodice <gianmarco.iodice@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/runtime/NEON/functions/NEDepthwiseConvolutionLayer.h b/arm_compute/runtime/NEON/functions/NEDepthwiseConvolutionLayer.h
index 659594f..6208c20 100644
--- a/arm_compute/runtime/NEON/functions/NEDepthwiseConvolutionLayer.h
+++ b/arm_compute/runtime/NEON/functions/NEDepthwiseConvolutionLayer.h
@@ -28,7 +28,7 @@
 #include "arm_compute/core/NEON/kernels/NEDepthwiseIm2ColKernel.h"
 #include "arm_compute/core/NEON/kernels/NEDepthwiseVectorToTensorKernel.h"
 #include "arm_compute/core/NEON/kernels/NEDepthwiseWeightsReshapeKernel.h"
-#include "arm_compute/core/NEON/kernels/NEDirectConvolutionLayerBiasAccumulateKernel.h"
+#include "arm_compute/core/NEON/kernels/NEDirectConvolutionLayerOutputStageKernel.h"
 #include "arm_compute/core/NEON/kernels/NEFillBorderKernel.h"
 #include "arm_compute/core/NEON/kernels/NEGEMMMatrixVectorMultiplyKernel.h"
 #include "arm_compute/core/Types.h"
@@ -67,10 +67,10 @@
     void run() override;
 
 private:
-    NEDepthwiseConvolutionLayer3x3Kernel         _kernel;
-    NEDirectConvolutionLayerBiasAccumulateKernel _bias_kernel;
-    NEFillBorderKernel                           _border_handler;
-    bool                                         _has_bias;
+    NEDepthwiseConvolutionLayer3x3Kernel      _kernel;
+    NEDirectConvolutionLayerOutputStageKernel _output_stage_kernel;
+    NEFillBorderKernel                        _border_handler;
+    bool                                      _has_bias;
 };
 
 /** Basic function to execute a generic depthwise convolution. This function calls the following NEON kernels: