another single pe becomes occupied even though only a single pe is opened.

[hyunsik]

Problem

Even though we open only a single pe, the remaining single pe becomes OCCUPIED state.

How to reproduce

>>> config = DeviceConfig(arch=Arch.Warboy, mode=DeviceMode.Single, count=2)
>>> find_device_files(config)
[npu0pe0, npu0pe1]
>>> config = DeviceConfig(arch=Arch.Warboy, mode=DeviceMode.Single, count=1)
>>> find_device_files(config)
[npu0pe0]
>>> pe0 = open("/dev/npu0pe0")
>>> find_device_files(config)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RuntimeError: Device warboy(1)*1 not found