Add the necessary arguments to the boot command-line in order to boot
a ChromiumOS image from USB.
BUG=chrome-os-partner:30840
TEST=Build and boot on FPGA
Change-Id: Ifec16875b6c29455e3dce0480947243d5049408a
Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/220068