Support new style flashmap labels for firmware signing
Support new style flashmap labels for firmware signing

BUG=chrome-os-partner:2316
TEST=tried signing firmware with old style and new style fmap and verified that it works.

Change-Id: I9076fe60308bdb787440486d592c9d5e72602199

Review URL: http://codereview.chromium.org/6516004

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