CRAS: dbus - remove unused header.
CRAS: dbus - remove unused header.

cras_dbus doesn't use timerfd anymore.

Change-Id: I0d0d30905f1d26ad72cad047262d409fadf62b59
Signed-off-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/66155
Reviewed-by: Chih-Chung Chang <ebe32a3bdce230d12f75781016b6b880113fb486@chromium.org>

drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd