Revert D95224222 (pytorch#18020)

Summary:
This diff reverts D95224222
Depends on D95837397
(The context such as a Sandcastle job, Task, SEV, etc. was not
provided.)

Depends on D95224222

Differential Revision: D95837435

Co-authored-by: Dark Knight <generatedunixname89002005232357@meta.com>

Author: JacobSzwejbka

examples/models/llama/runner/targets.bzl

@@ -6,21 +6,6 @@ def _get_operator_lib(aten = False):
     else:
         return ["//executorch/configurations:optimized_native_cpu_ops", "//executorch/extension/llm/custom_ops:custom_ops"]
 
-def _get_torchao_lowbit_deps():
-    """Returns torchao lowbit kernel deps for shared embedding and linear on ARM builds."""
-    if runtime.is_oss:
-        return []
-    else:
-        # Use select to conditionally include torchao lowbit kernels only on ARM64 builds
-        # These kernels are only available for aarch64 architecture
-        return select({
-            "DEFAULT": [],
-            "ovr_config//cpu:arm64": [
-                "//xplat/pytorch/ao/torchao/csrc/cpu/shared_kernels/embedding_xbit:op_embedding_xbit_executorch",
-                "//xplat/pytorch/ao/torchao/csrc/cpu/shared_kernels/linear_8bit_act_xbit_weight:op_linear_8bit_act_xbit_weight_executorch",
-            ],
-        })
-
 def get_qnn_dependency():
     # buck build -c executorch.enable_qnn=true //executorch/examples/models/llama/runner:runner
     # Check if QNN is enabled before including the dependency
@@ -63,7 +48,7 @@ def define_common_targets():
                 "//pytorch/tokenizers:llama2c_tokenizer",
                 "//pytorch/tokenizers:hf_tokenizer",
                 "//pytorch/tokenizers:regex_lookahead",
-            ] + (_get_operator_lib(aten)) + _get_torchao_lowbit_deps() + ([
+            ] + (_get_operator_lib(aten)) + ([
                 # Vulkan API currently cannot build on some platforms (e.g. Apple, FBCODE)
                 # Therefore enable it explicitly for now to avoid failing tests
                 "//executorch/backends/vulkan:vulkan_backend_lib",