Add android_system_label to symbols.xml

Change-Id: Id5ae4f440becb5039b189ea59a5c459178550e46
resume: fix recents showing up when waking the device with the home button

Screen is on but dispatcher is not enabled yet.

Change-Id: Ib98d595563ed3df5c7a1e6e4d5a4da83a721537c