uprev_firmware.sh: Add an option to use image.dev.bin

Before we mark stable firmware, we usually need to debug a board
through AP console. So we should optionally use image.dev.bin,
which enables AP serial input/output, as the main firmware binary.

TEST=build an updater with '--dev', update a DUT, and see AP
serial input/output work.

Change-Id: I2aec2f3a6bc53812684b8fa152b4ed50914c1d62
Reviewed-on: https://chromium-review.googlesource.com/501168
Commit-Ready: Philip Chen <philipchen@chromium.org>
Tested-by: Philip Chen <philipchen@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
1 file changed