A string represents the device ID.
For example:
Device ID: XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX
This object can not be read when hpnicfLicenseDeviceIDType is invalid,
and a file name with full path while hpnicfLicenseDeviceIDType is file.
For example:
Device ID: flash:/xxx.did