fix qnn export

Summary:
X-link: pytorch/executorch#9808

One missing item for the new tokenizer lib

Reviewed By: kirklandsign

Differential Revision: D72263224

Author: cccclai

pytorch_tokenizers/targets.bzl

@@ -28,6 +28,7 @@ def define_common_targets():
             "sentencepiece-py",
         ],
         deps = [
+            "fbsource//third-party/pypi/blobfile:blobfile",
             "fbsource//third-party/pypi/tiktoken:tiktoken",
             "fbsource//third-party/pypi/tokenizers:tokenizers",
         ],