Revert "[1/2] Base: Speed up booting on multicore devices"

This reverts commit 06fc9fba131efaf4d367d828d958c62c220821b7.
[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
Merge pull request #14 from VlikeBanana/kf

Fix