Remove unused includes from operators (pytorch#5538)

Summary:
Pull Request resolved: pytorch#5538

As titled.

Reviewed By: zonglinpeng

Differential Revision: D63204927

fbshipit-source-id: 024196aabd80bf0fa4e364c5f48a8cacfc404185

Author: mcremon-meta

backends/cadence/reference/operators/quantized_conv_out.cpp

@@ -9,8 +9,6 @@
 #include <executorch/backends/cadence/reference/kernels/kernels.h>
 
 #include <executorch/runtime/kernel/kernel_includes.h>
-#include <algorithm>
-#include <cmath>
 
 namespace impl {
 namespace reference {

backends/cadence/reference/operators/quantized_layer_norm.cpp

@@ -9,9 +9,7 @@
 #include <executorch/backends/cadence/reference/kernels/kernels.h>
 #include <executorch/runtime/kernel/kernel_includes.h>
 
-#include <algorithm>
 #include <cmath>
-#include <tuple>
 
 using Tensor = exec_aten::Tensor;
 using executorch::runtime::KernelRuntimeContext;