This gives a quicke example on how to use SPI asynchronous calls with
kernel's k_poll API.
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
This application intents to test an SPI driver by looping over MISO/MOSI
line where the controller will then send data to itself.
It will test various buffer tx/rx schemes.
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>