Update visibility of target examples/models/llama:source_transformation

Differential Revision: D69945779

Pull Request resolved: pytorch#8635

Author: YIWENX14

examples/models/llama/TARGETS

@@ -98,6 +98,7 @@ runtime.python_library(
     name = "source_transformation",
     visibility = [
         "//executorch/examples/...",
+        "@EXECUTORCH_CLIENTS",
     ],
     srcs = [
         "source_transformation/apply_spin_quant_r1_r2.py",