vboot_reference: Improve make_dev_firmware script.

Developers testing firmware preamble flags (usually for turn on/off RO-NORMAL
bits) need a easy way to change existing firmware, without hacking FDT source /
looking for complex script.

Also included some minor improvements:
 * Always enable FORCE_DEV_BOOT_USB and DISABLE_FW_ROLLBACK_CHECK. These are
   flags most developers need when leaving official signed normal firmware.
 * --bmpfv is deprecated because our latest firmware now always include
   official bitmaps in updater, no more DEV bitmaps.

BUG=none
TEST=./make_dev_firmware.sh -f bios.bin -t new_bios.bin --preamble_flags 0
     ./make_dev_firmware.sh -f bios.bin -t new_bios.bin --preamble_flags 1

Change-Id: I7ee72d32b4b7fa28f2be635fd8c7bb678852e132
Reviewed-on: https://gerrit.chromium.org/gerrit/28792
Tested-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Ready: Hung-Te Lin <hungte@chromium.org>
1 file changed