tpm2_key_protector: Dump the PCR bank for key unsealing

tpm2_key_protector: Dump the PCR bank for key unsealing

TPM 2.0 Key File format stores the PCR selection in the parameters
for TPM2_PolicyPCR and it already contains the selected PCR bank.
Currently, tpm2_key_protector dumped the PCR bank specified by the
--bank option, and it may not be the PCR bank for key unsealing.

To dump the real PCR bank for key unsealing, this commit records the PCR
bank used by TPM2_PolicyPCR and dumps PCR values from that bank when
necessary.

Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>