Rename PixelwiseMultiplications to Mul for simplicity

Changes the names of the following:
 - PixelWiseMultiplicationKernel to MulKernel for all backends
 - PixelWiseMultiplication to Mul for all backends

Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Change-Id: I88108c2d22c888fce37ea1028863026160b9da97
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5534
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/runtime/NEON/functions/NEPixelWiseMultiplication.h b/arm_compute/runtime/NEON/functions/NEPixelWiseMultiplication.h
index f8074e7..4684c2d 100644
--- a/arm_compute/runtime/NEON/functions/NEPixelWiseMultiplication.h
+++ b/arm_compute/runtime/NEON/functions/NEPixelWiseMultiplication.h
@@ -34,7 +34,7 @@
 class ITensor;
 class ITensorInfo;
 
-/** Basic function to run @ref cpu::CpuPixelWiseMultiplication */
+/** Basic function to run @ref cpu::CpuMul */
 class NEPixelWiseMultiplication : public IFunction
 {
 public:
@@ -131,7 +131,7 @@
     std::unique_ptr<Impl> _impl;
 };
 
-/** Basic function to run @ref cpu::CpuComplexPixelWiseMultiplication. */
+/** Basic function to run @ref cpu::CpuComplexMul. */
 class NEComplexPixelWiseMultiplication : public IFunction
 {
 public: