add backup cpu-arch detection if py-cpuinfo fails

[jeffra]

Follow-up to #1616. For some reason on A100-80GB machines we are seeing py-cpuinfo crash with the below stack trace. We are still debugging to see if we can identify a better fix on our side or propose a fix on py-cpuinfo side. This PR detects this error case and reverts to the old lscpu method if it works on that machine type.

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "<string>", line 2, in <module>
  File "/opt/conda/lib/python3.8/site-packages/cpuinfo/cpuinfo.py", line 2743, in get_cpu_info
    output = json.loads(output, object_hook = _utf_to_str)
  File "/opt/conda/lib/python3.8/json/__init__.py", line 370, in loads
    return cls(**kw).decode(s)
  File "/opt/conda/lib/python3.8/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/opt/conda/lib/python3.8/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

[RezaYazdaniAminabadi]

LGTM! thanks @jeffra