init: use an eventfd instead of socketpair to wake the main loop

eventfd is a more suitable mechanism.

Bug: 150863651
Test: boot CF, ctl.start services, reboot CF
Merged-In: Ie5c3b0c048afdd7afa4bfc4cba26bec3225925e5
Change-Id: Ie5c3b0c048afdd7afa4bfc4cba26bec3225925e5
(cherry picked from commit 40463336a88eba61208b5c2b3c54f4eacc03bfbc)
1 file changed