Gnss Hal Minor Cleanup

Enum sizes and names cleaned up, fixed errors in comments,
cleaned up some variable names.

Also removed AGnssRefLocation since it appears to be unused.

Bug:31974439
Test: mm

Change-Id: I88f43caac5ce9c7137e28b29ba55ea330786745f
diff --git a/gnss/1.0/IGnssMeasurementCallback.hal b/gnss/1.0/IGnssMeasurementCallback.hal
index 3650892..cc34c91 100644
--- a/gnss/1.0/IGnssMeasurementCallback.hal
+++ b/gnss/1.0/IGnssMeasurementCallback.hal
@@ -539,7 +539,7 @@
         uint32_t measurementCount;
 
         /* The array of measurements. */
-        GnssMeasurement[ConstS32:GNSS_MAX_MEASUREMENT] measurements;
+        GnssMeasurement[GnssMax:SVS_COUNT] measurements;
 
         /** The GNSS clock time reading. */
         GnssClock clock;