ShutdownThread: set soft reboot trigger accordingly

Change-Id: I72bd52aa1492d356e368e8c60897002c1f110172
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_frameworks_base into android-4.4
Add ability to play audio to Boot Animation

Just add an audio file named audio.mp3 to system/media to play during the bootanimation

Credit to Team Bamf

Change-Id: I94ef8020870578f7d6f255467076f778467dccbd