net: ot: rework NCP interface configuration

Rework NCP interface configuration and NCP sample. Remove
CONFIG_OPENTHREAD_COPROCESSOR_SPINEL_ON_UART_DEV_NAME and
CONFIG_OPENTHREAD_COPROCESSOR_SPINEL_ON_UART_ACM Kconfig
options in favor of chosen node zephyr,ot-uart usage.

Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
12 files changed