V4L/DVB: ir-nec-decoder: Add sysfs node to enable/disable per irrcv

With the help of raw_register/raw_unregister, adds a sysfs group
associated with the decoder, inside the corresponding irrcv node.

Writing 1 to nec_decoder/enabled enables the decoder, while
writing 0 disables it.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/IR/ir-raw-event.c b/drivers/media/IR/ir-raw-event.c
index 11f23f4..371d88e 100644
--- a/drivers/media/IR/ir-raw-event.c
+++ b/drivers/media/IR/ir-raw-event.c
@@ -223,7 +223,7 @@
 void ir_raw_init(void)
 {
 	spin_lock_init(&ir_raw_handler_lock);
-	
+
 #ifdef MODULE
 	INIT_WORK(&wq_load, init_decoders);
 	schedule_work(&wq_load);