init.rc: Inidicate that booting is complete wrt firwmare requests

ueventd will wait for /dev/.booting to go away before giving up
on loading firmware.
The issue was introduced in Ifdd5dd1e95d7e064dde5c80b70198882d949a710
which forgot to update recovery's init.rc

Bug: 17993625
Change-Id: I91205fe6eea50aaef9b401d650ec8d6843a92a57