Rename functions/classes for elementwise operations

* Create CpuElementwise operator
* Rename kernel classes
* Make the kernels stateless

Partially implements: COMPMID-4003

Change-Id: I4ef9c61a3acc3ac5dbe46463d62dcb88a5face21
Signed-off-by: Sang-Hoon Park <sang-hoon.park@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/4881
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Sheri Zhang <sheri.zhang@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/Android.bp b/Android.bp
index 7851eb6..6984bbe 100644
--- a/Android.bp
+++ b/Android.bp
@@ -245,7 +245,6 @@
         "src/core/NEON/kernels/NEDilateKernel.cpp",
         "src/core/NEON/kernels/NEDirectConvolutionLayerKernel.cpp",
         "src/core/NEON/kernels/NEDirectConvolutionLayerOutputStageKernel.cpp",
-        "src/core/NEON/kernels/NEElementwiseOperationKernel.cpp",
         "src/core/NEON/kernels/NEElementwiseUnaryKernel.cpp",
         "src/core/NEON/kernels/NEErodeKernel.cpp",
         "src/core/NEON/kernels/NEFFTDigitReverseKernel.cpp",
@@ -409,6 +408,7 @@
         "src/core/cpu/kernels/CpuConcatenateHeightKernel.cpp",
         "src/core/cpu/kernels/CpuConcatenateWidthKernel.cpp",
         "src/core/cpu/kernels/CpuCopyKernel.cpp",
+        "src/core/cpu/kernels/CpuElementwiseKernel.cpp",
         "src/core/cpu/kernels/CpuFillKernel.cpp",
         "src/core/cpu/kernels/CpuFloorKernel.cpp",
         "src/core/cpu/kernels/CpuPermuteKernel.cpp",
@@ -678,7 +678,7 @@
         "src/runtime/NEON/functions/NEDetectionPostProcessLayer.cpp",
         "src/runtime/NEON/functions/NEDilate.cpp",
         "src/runtime/NEON/functions/NEDirectConvolutionLayer.cpp",
-        "src/runtime/NEON/functions/NEElementwiseOperators.cpp",
+        "src/runtime/NEON/functions/NEElementwiseOperations.cpp",
         "src/runtime/NEON/functions/NEElementwiseUnaryLayer.cpp",
         "src/runtime/NEON/functions/NEEqualizeHistogram.cpp",
         "src/runtime/NEON/functions/NEErode.cpp",
@@ -787,6 +787,7 @@
         "src/runtime/cpu/operators/CpuAdd.cpp",
         "src/runtime/cpu/operators/CpuConcatenate.cpp",
         "src/runtime/cpu/operators/CpuCopy.cpp",
+        "src/runtime/cpu/operators/CpuElementwise.cpp",
         "src/runtime/cpu/operators/CpuFill.cpp",
         "src/runtime/cpu/operators/CpuFloor.cpp",
         "src/runtime/cpu/operators/CpuPermute.cpp",