Add app.overlay which contains chosen node and cdc-acm-uart node.
Rework sample to get CDC ACM UART device from devicetree.
Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
After the removal of the virtualcom DT node in 5071eee, using the chosen
node is no longer functional. Instead the Kconfig
CONFIG_UART_CONSOLE_ON_DEV_NAME is used to locate the correct UART.
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>