spring: Fix a bug that yellow LED is not turned off
spring: Fix a bug that yellow LED is not turned off

When leaving breathing mode, we should switch yellow LED from lighting
engine back to PWM control.

BUG=chrome-os-partner:18244
TEST=Check yellow LED leaves breathing mode
BRANCH=spring

Change-Id: I39260ac9040baaf193ce95eec7941aeb6d97e7e8
Signed-off-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/45436
Reviewed-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

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