Buck Fix to enable opt level = 3 for internal model export (#7793)

Summary:

#7793
[OSS ET] Buck Fix to enable opt level = 3 for internal model export

Reviewed By: derekxu

Differential Revision: D68446241

Author: billmguo

backends/qualcomm/runtime/targets.bzl

@@ -44,8 +44,7 @@ def define_common_targets():
                     "*.cpp",
                     "backends/*.cpp",
                     "backends/htpbackend/*.cpp",
-                    "backends/htpbackend/aarch64/*.cpp",
-                ],
+                ] + (["backends/htpbackend/x86_64/*.cpp"] if include_aot_qnn_lib else ["backends/htpbackend/aarch64/*.cpp"]),
                 exclude = ["Logging.cpp"],
             ),
             exported_headers = glob(