Some samples, tests got missed in the switch from void main() to int main(). Cleanup those samples/tests to use int main(). Signed-off-by: Kumar Gala <kumar.gala@intel.com>
Added a sample for the rpi_pico board showing how to use the UART over PIO driver. Signed-off-by: Yonatan Schachter <yonatan.schachter@gmail.com>