Moves the USB CDC device to the USB CDC port instead of wrongly
using the serial port, this was not used but is needed to prevent a
build error added to MCUboot which prevents using the same device
for console and serial recovery chosen nodes
Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>
Adds a test that exercises the boot mode (retention subsystem)
feature to check that an application can successfully boot into
mcuboot's serial recovery mode.
Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>