从hibernate唤醒后唤醒源获取失败

这是一个硬件bug, 新版应该在六，七月的样子。 可参考如下方法，看是否有帮助：

This is a limitation in our current silicon and there are no direct ways of getting the wakeup cause from HIBernation.

Please consider if you could use some indirect means of determining the wake source depending on your usecase. For instance, the elapsed duration in HIBernation can be approximately determined by saving the last SlowClockCount and deducting it from the current value after the wakeup. If this is close to the value set as HIBernate duration, the source can be Slow clock wakeup.