leds: convert blink timer to workqueue
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>
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