Rollback_index funcs now all return 0 if succcess, nonzero if error.
(Note: not fully implemented; Luigi, please clean this up in a
subsequent CL)
LoadKernel() checks return codes from TPM funcs.
LoadKernel() only looks at versions from TPM in normal boot mode.
Review URL: http://codereview.chromium.org/2735004
This creates a new vboot_firmware subdirectory, and which contains the
entirety of the BIOS code. There shouldn't be anything in this directory
that is NOT required by the BIOS.
Review URL: http://codereview.chromium.org/2219004
