staging: lirc: Add fallthrough comment

This patch adds fallthrough comments for the cases not preceded by
break or fallthrough comment

Signed-off-by: Andreea-Cristina Bernat <bernat.ada@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>

diff --cc drivers/staging/media/lirc/lirc_imon.c
Simple merge

diff --cc drivers/staging/media/lirc/lirc_sasem.c
Simple merge