rootdir: Fix system emulation startup.

This fixes the goldfish-specific config scripts used by init and ueventd
to properly setup the system under emulation. This fixes a lot of broken-ess
introduced by recent permission changes in the system.

Note that there are still several problems after this patch is applied, but
at least it becomes possible to get an adb connection to the emulated system,

Change-Id: Iff47bbf0fe5cb759fa93089284bb0f71e32405a2