Change the initial value of mLastBarringInfo

If the device has never camped on any network after booting,
the selector doesn't receive the BarringInfo.
So the domain selection stucks. With non-null initial value
even in this edge case, the selector continues to work.
Reset the last BarringInfo if the radio state is off or unavailable.

Bug: 264601502
Test: manual
Change-Id: Id6d6bf4ddad73645b071cb856d30f48339f6cac8