[media] mceusb: really fix remaining keybounce issues

Make sure rawir struct is zeroed out before populating it for each
ir_raw_event_store_with_filter() call, and when we see a trailing 0x80
packet (end-of-data), issue an ir_raw_event_reset() call.

Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>