Add annotations to create gnss-base.h

This is required to make sure that the constants in gps.h does not
ever go out of sync with the enums created out of them in the HAL
interface definition.

Test: mm

Change-Id: I103cf46d198e9f5de9e0cfd64f2795f0094ecb39
diff --git a/gnss/1.0/IAGnssRil.hal b/gnss/1.0/IAGnssRil.hal
index 499b874..6292273 100644
--- a/gnss/1.0/IAGnssRil.hal
+++ b/gnss/1.0/IAGnssRil.hal
@@ -25,12 +25,14 @@
  * location, unique subscriber ID, phone number string and network availability changes.
  */
 interface IAGnssRil {
+    @export(name="", value_prefix="AGPS_SETID_TYPE_")
     enum SetIDType : uint8_t {
         NONE    = 0,
         IMSI    = 1,
         MSISDM  = 2
     };
 
+    @export(name="", value_prefix="AGPS_RIL_NETWORK_TYPE_")
     enum NetworkType : uint8_t {
         MOBILE  = 0,
         WIFI    = 1,
@@ -41,6 +43,7 @@
         WIMAX   = 6,
     };
 
+    @export(name="", value_prefix="AGPS_REF_LOCATION_TYPE_")
     enum AGnssRefLocationType : uint8_t {
         GSM_CELLID   = 1,
         UMTS_CELLID  = 2,