Revert "Revert "Update GNSS Batching to use new GnssLocation with elapsed realtime (HAL)""

This reverts commit b3721a68f273c305ea8e151cd3a8c192605370fc.

Reason for revert: 
It appears that the build includes ag/6721678 but not ag/6762021 even though they both were submitted together. Hence the build errors.

Change-Id: I4e58b29239d291ae3621b90e4507de8eb8838298
diff --git a/gnss/2.0/default/Android.bp b/gnss/2.0/default/Android.bp
index 64187e2..0fcd764 100644
--- a/gnss/2.0/default/Android.bp
+++ b/gnss/2.0/default/Android.bp
@@ -25,6 +25,7 @@
         "AGnss.cpp",
         "AGnssRil.cpp",
         "Gnss.cpp",
+	"GnssBatching.cpp",
         "GnssMeasurement.cpp",
         "GnssMeasurementCorrections.cpp",
         "GnssVisibilityControl.cpp",