fix torchtune internal CI after the quantize_ API refactor (#1184)

Summary:
Pull Request resolved: #1184

att

Reviewed By: RdoubleA

Differential Revision: D59822075

torchtune/utils/quantization.py

@@ -15,11 +15,12 @@
 
 from torchtune.modules.low_precision._utils import (
     _get_torchao_version,
+    _is_fbcode,
     _nightly_version_ge,
 )
 
 ao_version, is_nightly = _get_torchao_version()
-if is_nightly and _nightly_version_ge(ao_version, "2024-07-03"):
+if _is_fbcode() or (is_nightly and _nightly_version_ge(ao_version, "2024-07-03")):
     from torchao.quantization.quant_api import quantize_ as quantize
 else:
     from torchao.quantization.quant_api import quantize