Remove internal use of ProvisionStatus #8
Description
ProvisionStatus is used internally in one place - at the start of ProvisionTPM, and only to check whether owner clear has been disabled. It doesn't make use of any other of the returned attributes. This should be removed in favour of just attempting the TPM2_Clear command and checking if the returned error is a *tpm2.TPMError with an error code of tpm2.ErrorDisabled.