PackageManager: Fix concurrent access to shared state

Stop multiple threads from all calling add on the same HashMap.

Cleanup the use of a boolean flag by removing concurrent writes
to it.

Change-Id: I8d61fe7294dcb67ee7d0d7de88d90d2051c310e6
bootanim: Add quickboot support

 * Add two new prefixes "i" and "o" for QuickBoot intro and outro.

Change-Id: I2c4fed0bc597aeb7bd31c1cb64961b8fdd264756
Add android_system_label to symbols.xml

Change-Id: Id5ae4f440becb5039b189ea59a5c459178550e46

Conflicts:
	core/res/res/values/symbols.xml