trivial: tpm-eventlog: Modify `-p` argument behavior
trivial: tpm-eventlog: Modify `-p` argument behavior

If using this argument, only display the final calculated value.

fwupd/fwupd,fwupd/fwupd,fwupd/fwupd,hughsie/fwupd,hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,hughsie/fwupd