don't complain about CDMA support on non-CDMA devices

GpsLocationProvider emits a message on CDMA phones, warning about
lack of CDMA support. It also emits this message on every other
non-GSM device. I've pulled the conditions in a bit for this so that
it only happens on actual CDMA devices.

Change-Id: I1a122e2599c83c730be014c61385e60ef819b5a1