[media] siano: remove the ir protocol field

This field is unused. Remove it.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/common/siano/smsir.h

@@ -40,7 +40,6 @@ struct ir_t {
 	char phys[32];
 
 	char *rc_codes;
-	u64 protocol;
 
 	u32 timeout;
 	u32 controller;