Add buck file to selective build (#3812)

Summary:
Pull Request resolved: #3812

So we can build in xplat.

Also remove unused dependencies to scalar_utils.

Reviewed By: larryliu0820

Differential Revision: D57950299

fbshipit-source-id: f47a69a2edd2c8f66de9d9b42565d1f65d2b98c0

Author: lucylq

kernels/portable/cpu/util/broadcast_util.cpp

@@ -6,7 +6,6 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-#include <executorch/kernels/portable/cpu/scalar_utils.h>
 #include <executorch/kernels/portable/cpu/util/repeat_util.h>
 #include <executorch/runtime/core/exec_aten/exec_aten.h>
 #include <executorch/runtime/core/exec_aten/util/scalar_type_util.h>

kernels/portable/cpu/util/matmul_ops_util.cpp

@@ -8,7 +8,6 @@
 
 #include <cstring>
 
-#include <executorch/kernels/portable/cpu/scalar_utils.h>
 #include <executorch/kernels/portable/cpu/util/broadcast_util.h>
 #include <executorch/kernels/portable/cpu/util/matmul_ops_util.h>
 

kernels/portable/cpu/util/targets.bzl

@@ -44,7 +44,6 @@ def define_common_targets():
         compiler_flags = ["-Wno-missing-prototypes"],
         deps = [
             ":repeat_util",
-            "//executorch/kernels/portable/cpu:scalar_utils",
             "//executorch/runtime/kernel:kernel_includes",
             "//executorch/runtime/core/exec_aten/util:tensor_util",
         ],
@@ -114,7 +113,6 @@ def define_common_targets():
         deps = [
             ":broadcast_util",
             "//executorch/runtime/kernel:kernel_includes",
-            "//executorch/kernels/portable/cpu:scalar_utils",
         ],
         visibility = ["//executorch/kernels/portable/cpu/...", "//executorch/kernels/optimized/cpu/..."],
     )
@@ -151,7 +149,6 @@ def define_common_targets():
             "transpose_util.h",
         ],
         deps = [
-            "//executorch/kernels/portable/cpu:scalar_utils",
             "//executorch/runtime/kernel:kernel_includes",
             "//executorch/runtime/core/exec_aten/util:tensor_util",
         ],