Re-add "lib: add support for LZ4-compressed kernel""

This reverts commit 3602ff115da784543021b238a4f4cf6b04f6f7d9.

Change-Id: I7f2eb3a459eb53a5acedf636b5a79e9cc2969105
Merge "Re-add "lib: add support for LZ4-compressed kernel""" into jb4.2