This patch converts the blink timer from led-core to workqueue which is more
suitable for this kind of non-priority operations. Moreover, timer may lead to
errors when a LED setting function use a scheduling function such as pinctrl
which is using mutex.
Signed-off-by: NVincent Donnefort <vdonnefort@gmail.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>