Resets radio on RIL_CONNECTED, but only after the first RIL_CONNECTED response.

VS985 radio starts by powering itself off, which leads to a race
situation where the radio powers on, then reads the power off message,
powering itself off again.

Allow the initial power off to be skipped.

Change-Id: I7816483e68955645788cbaf9b117952e8205e96f