Adds -a option to tpm2_nvread
Adds -a option to tpm2_nvread

If you do not specify the -a option, the auth handle defaults
to TPM2_RH_PLATFORM which would mean we would need to provide the
platform authorization.

Resolves: #211

mit-ll/python-keylime,mit-ll/python-keylime,mit-ll/python-keylime,mit-ll/python-keylime