Fix "tpmc help" description of pplock
Fix "tpmc help" description of pplock

BUG=none
TEST=none

Change-Id: I2a976f6e876ff7751a746ea89211795ab454e65d
Reviewed-on: http://gerrit.chromium.org/gerrit/4458
Reviewed-by: Luigi Semenzato <5004afe206914bdd0a6fc6438682f9b308a36be6@chromium.org>
Tested-by: Gaurav Shah <2987db6a10bcfe664554a372d01e80df7fd325a3@chromium.org>

marineam/seismograph,acorn-marvell/vboot_reference,ionave/seismograph,coreboot/vboot,ccaapton/vboot_reference,geekboxzone/mmallow_external_vboot_reference,marineam/seismograph,geekboxzone/mmallow_external_vboot_reference,coreboot/vboot,geekboxzone/mmallow_external_vboot_reference,acorn-marvell/vboot_reference,geekboxzone/mmallow_external_vboot_reference,ccaapton/vboot_reference,ionave/seismograph,coreboot/vboot,coreboot/vboot,acorn-marvell/vboot_reference,ccaapton/vboot_reference,marineam/seismograph,marineam/seismograph,ionave/seismograph,coreboot/vboot,ccaapton/vboot_reference,acorn-marvell/vboot_reference,geekboxzone/mmallow_external_vboot_reference