Use a more precise Kconfig symbol name to avoid namespace conflicts when
more NRFX-dependent drivers will be added.
Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Make use of the new MBOX APIs to create a ping-pong sample application.
This sample is using the NRFX IPC peripheral to send and receive signals
on different channels
Signed-off-by: Carlo Caione <ccaione@baylibre.com>