init: Set ADDR_COMPAT_LAYOUT before spawning processes.

Some Android programs have problems with memory which grows
from the top down.  Temporarily set ADDR_COMPAT_LAYOUT to
avoid breaking those programs.

Bug: 7188322
Change-Id: I61760500e670b4563838c63b82d4a0b6e354a86e
Merge remote-tracking branch 'upstream/jb4.3' into slim-4.3