[BusyBox] Init utility options are too general

[Cameron Rich]

Version: busybox-1.00-pre

When using "make menuconfig":

Disabling "init" in "init utilities" disables halt, poweroff and reboot.

These are utilities that are still useful even if a customized init is 
being used (such as what we are doing). We'd still like to be able to 
individually select the other utilities ("reboot" in our case) and 
disable "init".

Cheers,

Cameron