Add Chromium prebuilt and fixup device specific OUT dir [2/2]

Updated code for Lollipop by Omnirom and Paranoid

IMPORTANT: remember to add:
export USE_PREBUILT_CHROMIUM=1
in the build script!

Change-Id: I119f02df84ea1f4551f8890e29822da775a4a48b
Merge branch 'lp5.0' of git://github.com/ezio84/vendor_slim into lp5.0