tpm/ppi: Possibly show command parameter if TPM PPI 1.3 is used

TPM PPI 1.3 introduces an additional optional command parameter
that may be needed for some commands. Display the parameter if the
command requires such a parameter. Only command 23 needs one.

The PPI request file will show output like this then:

   # echo "23 16" > request
   # cat request
   23 16

   # echo "5" > request
   # cat request
   5

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: David Safford <david.safford@ge.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>