GPS Provider Service changes

GPS engine needs to receive network state changes from Android fw.

Added db query for the current APN, also added a new parameter
between JNI / HAL to the new method in AGpsRilInterface struct
for gps engine to receive APN from GPSLocationService

Change-Id: I62e35c948d2ac1961771d1a10581a3b8e695c05a
Signed-off-by: Mike Lockwood <lockwood@android.com>