Adds a command which can be used to enter mcuboot's serial recovery
mode when the retention subsystem is enabled.
Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>
Adds a boot mode system which allows for redirecting the boot
target of a device depending upon the state of a retained value.
Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>