device-types: add emmc boot method to for Depthcharge
Add a generic emmc boot method to base-depcharge.jinja2 to enable booting the device from the eMMC. Typical extra kernel arguments for booting a Chrome OS image are:
root=/dev/mmcblk0p3 cros_debug cros_secure
These need to be set in the job definition to match the image and kernel being used.
Signed-off-by: Guillaume Tucker guillaume.tucker@collabora.com