Use bitfield type in GNSS HAL.

Test: mma

Change-Id: I92acf537a489fb06d942d3aa19ec9f40ffe26c23
diff --git a/gnss/1.0/IGnssCallback.hal b/gnss/1.0/IGnssCallback.hal
index 97a28e2..b072807 100644
--- a/gnss/1.0/IGnssCallback.hal
+++ b/gnss/1.0/IGnssCallback.hal
@@ -179,7 +179,7 @@
      * @param capabilities Capability parameter is a bit field of
      * the Capabilities enum.
      */
-    gnssSetCapabilitesCb(uint32_t capabilities);
+    gnssSetCapabilitesCb(bitfield<Capabilities> capabilities);
 
     /*
      * Callback utility for acquiring the GNSS wakelock. This can be used to prevent