V4L/DVB (11887): Siano: smscards - add board (target) events

Add events handling for targets. All board-specific
(target specific) should reside here.

Signed-off-by: Uri Shkolnik <uris@siano-ms.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>