vboot: change USB_BOOT_ON_DEV to use build flag
Instead of calling VbExGetSwitches to essentially retrieve a
compile-time config value from depthcharge, send this config
value to vboot_reference as a build flag.
Add a test based on the value of USB_BOOT_ON_DEV.
BUG=b:124141368, chromium:1035761
TEST=make clean && make runtests
TEST=Add CONFIG_USB_BOOT_ON_DEV to defconfig and flash to device
Switch to dev mode and confirm dev_boot_usb with crossystem
BRANCH=none
Change-Id: I70a2e3fcd8c5cc252ca3d0eed81490a08503d7b3
Cq-Depend: chromium:1975346
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1975450
Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>
Commit-Queue: Joel Kitching <kitching@chromium.org>
Tested-by: Joel Kitching <kitching@chromium.org>
5 files changed
