Fix method for CDMA/GSM APN List Product Copy

Because product copy will only allow the first call to a target, the CDMA APN list was never copied using the old method.

This commit requires TARGET_RADIO_TYPE := cdma to be defined in the pa_<device>.mk file in vendor/pa/products.

Change-Id: I8038a8eba0c6201237616177aac37de0dba407f6