Update on "[Executorch] Add quantized kv cache to oss ci"

Fixes to make sure quantized kv cache works in oss

Differential Revision: [D66269487](https://our.internmc.facebook.com/intern/diff/D66269487/)

[ghstack-poisoned]

Author: kimishpatel

examples/models/llama/source_transformation/quantized_kv_cache.py

@@ -248,7 +248,6 @@ def from_float(cls, kv_cache, cache_type: QuantizedCacheType):
 
 def replace_kv_cache_with_quantized_kv_cache(module):
     # This is needed to ensure that custom ops are registered
-    from executorch.extension.pybindings import portable_lib  # noqa # usort: skip
     from executorch.extension.llm.custom_ops import custom_ops  # noqa: F401
 
     logging.warning(