Set CDMA Location to Invalid if on Null Island

If the reported CDMA location is ~= (0, 0), which
is in the middle of the Gulf of Guinea, assert that
there are no CDMA cell towers within range (there
are not) and force the location to a saner default
value of Integer.MAX_VALUE which is out of the range
of valid lats+longs.

Bug: 32364031
Test: runtest frameworks-telephony
Change-Id: I3f50054dd37cf7cef56b1bd16c3313c02da34c31