Revert "Fix for multicore bootup"

This reverts commit 7f04f4b104bd75a953dbbafec464ce5df2053605.
Revert "[1/2] Speed up booting on multicore devices."

This reverts commit 22df67b011aa97142365effbd27f727ac06cbf6b.
[1/2] Speed up booting on multicore devices.

1. Add multithreading support to Installer/installd.
2. Parallelize package scanning.
3. Parallelize boot dexopt.

Change-Id: Id42b2bf4a737f93f9ecd9b5819344adbb735f0fb

Conflicts:
	services/java/com/android/server/pm/PackageManagerService.java