Add cdba-server side support for "fastboot continue" which allows
fastboot to continue its default boot process.
I find it useful to setup my boards with an additional SD card which I
frequently use the default image on eMMC to chroot to and populate
modules, rebooting into fastboot and subsequently booting via fastboot
a rootfs on the SD card.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Boards implementing a/b partitioning even for fastboot boot might
sometimes expire the counter and fail the boot. By always setting the
active image to 'a' we're catching this case and flipping it back, and
in other cases the operation becomes a nop.
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
