cros_bundle_firmware: add support for fast-developer-mode

Adding fast-developer-mode to chromeos-config in the dts
will make the developer screen stay for 2s instead of 30s
to optimize factory time.

Also needs
https://gerrit.chromium.org/gerrit/#change,16113

BUG=chrome-os-partner:7671
TEST=manual

  emerge-stumpy chromeos-bootimage
  gbb_utility -g --flags /build/stumpy/firmware/image.bin

Should report "flags: 0x00000001"

Reviewed-on: https://gerrit.chromium.org/gerrit/16845
Commit-Ready: Stefan Reinauer <reinauer@chromium.org>
Tested-by: Stefan Reinauer <reinauer@chromium.org>
Reviewed-by: Stefan Reinauer <reinauer@chromium.org>

(cherry picked from commit 975e68f56c4cba100c5a295776c38ef868c98e93)

Change-Id: I8f1935d2c68faaf5d870298a96410aa586f4aa2a
Reviewed-on: https://gerrit.chromium.org/gerrit/16855
Tested-by: Stefan Reinauer <reinauer@chromium.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
1 file changed