Throw away initial measurements before interval tests

Bug: 264597734
Test: atest VtsHalGnssTargetTest
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:dbab0de442246a78c42acf5ca7c4f7c94fd82651)
Merged-In: I1064807adf3264f13c1ef6678df37cff350503c5
Change-Id: I1064807adf3264f13c1ef6678df37cff350503c5

NOTE FOR REVIEWERS - original patch and result patch are not identical.
PLEASE REVIEW CAREFULLY.
Diffs between the patches:
47,6 +447,7 @@
                                               const int numMeasurementEvents,
                                               const int timeoutSeconds,
                                               std::vector<int>& deltasMs) {
+    callback->gnss_data_cbq_.reset();  // throw away the initial measurements if any
     int64_t lastElapsedRealtimeMillis = 0;
     for (int i = 0; i < numMeasurementEvents; i++) {
         GnssData lastGnssData;

Original patch:
From dbab0de4 Mon Sep 17 00:00:00 2001
From: Yu-Han Yang <yuhany@google.com>
Date: Tue, 07 Feb 2023 19:01:56 +0000
Subject: [PATCH] Throw away initial measurements before interval tests

Bug: 264597734
Test: atest VtsHalGnssTargetTest
Change-Id: I1064807adf3264f13c1ef6678df37cff350503c5
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