vboot module: fix compilation issues

There were 3 things stopping the vboot module from being

1. The vboot_reference code removed in the firmware/arch/$(ARCH)/include
   directory. This caused romcc to fail because romcc fails if -I<dir>
   points to non-existent directory.
2. The rmodule API does not have the no-clearing-of-bss variant of the
   load function.
3. cbfs API changes.

Change-Id: I1e1296c71c5831d56fc9acfaa578c84a948b4ced
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/2881
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2 files changed