Expand visibility of targets needed for executorch_llama2 kernel

Summary: See title

Differential Revision: D56361946

Author: stephenbo-meta

examples/models/llama2/TARGETS

@@ -36,6 +36,7 @@ runtime.python_library(
     },
     visibility = [
         "//bento/...",
+        "//bento_kernels/...",
         "//executorch/...",
     ],
     deps = [
@@ -74,6 +75,7 @@ runtime.python_library(
     base_module = "executorch.examples.models.llama2",
     visibility = [
         "//bento/...",
+        "//bento_kernels/...",
         "//executorch/examples/...",
     ],
     deps = [

examples/models/llama2/tokenizer/targets.bzl

@@ -51,6 +51,7 @@ def define_common_targets():
         visibility = [
             "//executorch/examples/...",
             "//bento/...",
+            "//bento_kernels/...",
         ],
         _is_external_target = True,
         deps = [] if runtime.is_oss else ["fbsource//third-party/pypi/sentencepiece:sentencepiece"],