Cleanup executorch::aten::... for cadence operators.

Summary:
1. Remove all using-declarations and `namespace at/c10 = ...` from headers.
2. Use `::executorch::aten::...` instead of `at::...` or `c10::...` in cpp files.

Reviewed By: dbort

Differential Revision: D64864409

Author: hsharma35

backends/cadence/hifi/operators/op_add.cpp

@@ -14,18 +14,18 @@
 #include <executorch/runtime/kernel/kernel_includes.h>
 #include <executorch/runtime/platform/assert.h>
 
-using exec_aten::Scalar;
-using exec_aten::ScalarType;
-using exec_aten::Tensor;
-using executorch::runtime::can_cast;
-using executorch::runtime::CppTypeToScalarType;
-using executorch::runtime::KernelRuntimeContext;
-using torch::executor::Error;
-
 namespace impl {
 namespace HiFi {
 namespace native {
 
+using ::executorch::aten::Scalar;
+using ::executorch::aten::ScalarType;
+using ::executorch::aten::Tensor;
+using ::executorch::runtime::can_cast;
+using ::executorch::runtime::CppTypeToScalarType;
+using ::executorch::runtime::Error;
+using ::executorch::runtime::KernelRuntimeContext;
+
 namespace {
 template <
     bool can_cast,

backends/cadence/hifi/operators/op_tanh.cpp

@@ -11,10 +11,10 @@
 #include <executorch/runtime/kernel/kernel_includes.h>
 #include <cmath>
 
-using exec_aten::ScalarType;
-using exec_aten::Tensor;
-using executorch::aten::RuntimeContext;
-using torch::executor::Error;
+using ::executorch::aten::RuntimeContext;
+using ::executorch::aten::ScalarType;
+using ::executorch::aten::Tensor;
+using ::executorch::runtime::Error;
 
 namespace cadence {
 namespace impl {
@@ -41,4 +41,4 @@ Tensor& tanh_out(RuntimeContext& ctx, const Tensor& in, Tensor& out) {
 } // namespace native
 } // namespace HiFi
 } // namespace impl
-} // namespace cadence
+} // namespace cadence

backends/cadence/hifi/operators/targets.bzl

@@ -17,7 +17,8 @@ def define_common_targets():
         ]),
         platforms = CXX,
         deps = [
-            "//executorch/kernels/portable/cpu/util:broadcast_util",
+            "//executorch/kernels/portable/cpu/util:all_deps",
+            "//executorch/kernels/portable/cpu/pattern:all_deps",
             "//executorch/runtime/kernel:kernel_includes",
             "//executorch/kernels/portable/cpu:scalar_utils",
             "fbsource//third-party/nnlib-hifi4/xa_nnlib:libxa_nnlib",