Revert "Remove __sinit and __sdidinit."

This reverts commit 4371961e.

This broke booting; ueventd crashes with a null pointer dereference
somewhere in __sfp (but the kernel doesn't unwind, so I don't know
what was calling __sfp).

Change-Id: I65375fdfdf1d339a06558b4057b580cacd6324e2