To allow easily building samples using the shell, without needing to
specify additional configurations. Tested with:
```
west build -b nrf52840dk/nrf52840 \
-S nus-console` \
samples/subsys/shell/shell_module
```
Signed-off-by: Luis Ubieda <luisf@croxel.com>
Allowing to be applied on various samples to enable UART over Bluetooth
LE NUS without added complexity.
Tested with nrf52840dk/nrf52840 on the following samples:
- samples/subsys/console/echo.
- samples/subsys/console/getchar.
- samples/subsys/console/getline.
- samples/subsys/logging/logger.
Signed-off-by: Luis Ubieda <luisf@croxel.com>