BUG=b:35775100
BRANCH=None
TEST=Verified that tablet mode switch events can be seen in evtest.
Event: time 1489093184.754803, -------------- SYN_REPORT ------------
Event: time 1489093196.842930, type 5 (EV_SW), code 1 (SW_TABLET_MODE), value 0
Event: time 1489093196.842930, -------------- SYN_REPORT ------------
Event: time 1489093198.839809, type 5 (EV_SW), code 1 (SW_TABLET_MODE), value 1
Event: time 1489093198.839809, -------------- SYN_REPORT ------------
Change-Id: Id47e817ba12294cc07281df3e04a9d68dec40ee7
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/451582
Reviewed-by: Aaron Durbin <adurbin@chromium.org>