Make scalar_utils more visible (pytorch#11945)

This PR was created by the merge bot to help merge the original PR into
the main branch.
ghstack PR number: pytorch#11862 by
@swolchok
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ghstack PR base:
https://github.com/pytorch/executorch/tree/gh/swolchok/466/base
ghstack PR head:
https://github.com/pytorch/executorch/tree/gh/swolchok/466/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head:
https://github.com/pytorch/executorch/tree/gh/swolchok/466/orig
@diff-train-skip-merge

Co-authored-by: Scott Wolchok <[email protected]>

Author: pytorchbot

kernels/portable/cpu/targets.bzl

@@ -72,8 +72,9 @@ def define_common_targets():
         srcs = [],
         exported_headers = ["scalar_utils.h", "selective_build.h"],
         visibility = [
-            "//executorch/kernels/portable/cpu/...",
+            "//executorch/kernels/fb/...",
             "//executorch/kernels/optimized/cpu/...",
+            "//executorch/kernels/portable/cpu/...",
             "//executorch/kernels/portable/test/...",
             "@EXECUTORCH_CLIENTS",
         ],