swtpm_setup: Add support for --reconfigure flag to change active PCR banks

swtpm_setup: Add support for --reconfigure flag to change active PCR banks

Add support for --reconfigure option for the swtpm_setup to be able to
change the active PCR banks. This option only works with --tpm2 and does
not allow to pass several other options such --create-ek or
--create-ek-cert or --create-platform-cert that would alter the state of
the TPM 2 in other ways.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>