factory_WriteGBB and hardware_Components support locating file using HWID.

The HWID value is obtained by previous hardware component matching.

TEST=runin and final test in factory test
BUG=chrome-os-partner:501

Change-Id: Ib0c0616518828383efe61e05e989e1b45a0f619b

Review URL: http://codereview.chromium.org/3270012
2 files changed