!15424 refactor eltwise_grad on cpu kernel: code style check

From: @zyx5256
Reviewed-by: @wuxuejian,@liangchenghui
Signed-off-by: @wuxuejian

mindspore/ccsrc/backend/kernel_compiler/cpu/eltwise_grad_cpu_kernel.cc

@@ -21,7 +21,6 @@
 
 namespace mindspore {
 namespace kernel {
-
 template <typename T>
 void EltWiseGradCPUKernel<T>::ReluGrad(const T *input1, const T *input2, T *out, size_t start, size_t end) {
   for (size_t i = start; i < end; i++) {