Input events with no associated device structure are valid. Handle them
in the sample by printing NULL instead of crashing trying to lookup the
device name.
Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
Add a first input sample in the subsys/input directory. This just prints
any input event on the console.
Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>