Trigger lightbar pattern from charger task if necessary
Trigger lightbar pattern from charger task if necessary

If we have a lightbar, but no PD, then plugging the device in will
not trigger the battery-level pattern. This allows us to trigger
it from the charger task instead if we change AC status and don't
have a PD.

BRANCH=ToT
BUG=None
TEST=plug and unplug charger from device, make sure the lightbar
  plays the right pattern

Change-Id: I8f37aaff2ddb9d936e13489cb404caee822418a1
Signed-off-by: Eric Caruso <b4dfd424537681137c06263971140211e84cb3c6@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/292943
Reviewed-by: Bill Richardson <129945214b1d548d8e49b6c29c43094f8c78057f@chromium.org>

fourier49/BIZ_EC,fourier49/BIZ_EC,fourier49/BIZ_EC,fourier49/BIZ_EC