[MKL-DNN] Reimplement elementwise_mul using Binary primitive of MKL-DNN
Created by: jczaja
This issue is to track progress on reimplementation of elementwise_mul_mkldnn op (currently no MKL-DNN is used there , but custom JIT code working on MKL-DNN formats) with MKL-DNN binary primitive (Introduced at DNNL/MKL-DNN version of 1.1)