Allow negative value for CorrelationVector#samplingStartM

Bug: 195934893
Test: on cuttlefish
Change-Id: Ief1514c8d8e48c9c3f13b93c3d2c355a508a84a7
diff --git a/gnss/aidl/vts/gnss_hal_test_cases.cpp b/gnss/aidl/vts/gnss_hal_test_cases.cpp
index 91999f6..0cd782e 100644
--- a/gnss/aidl/vts/gnss_hal_test_cases.cpp
+++ b/gnss/aidl/vts/gnss_hal_test_cases.cpp
@@ -251,7 +251,6 @@
                 for (const auto& correlationVector : measurement.correlationVectors) {
                     ASSERT_GE(correlationVector.frequencyOffsetMps, 0);
                     ASSERT_GT(correlationVector.samplingWidthM, 0);
-                    ASSERT_GE(correlationVector.samplingStartM, 0);
                     ASSERT_TRUE(correlationVector.magnitude.size() > 0);
                     for (const auto& magnitude : correlationVector.magnitude) {
                         ASSERT_TRUE(magnitude >= -32768 && magnitude <= 32767);
diff --git a/gnss/common/utils/default/Utils.cpp b/gnss/common/utils/default/Utils.cpp
index d136448..23e39b2 100644
--- a/gnss/common/utils/default/Utils.cpp
+++ b/gnss/common/utils/default/Utils.cpp
@@ -221,7 +221,7 @@
         aidl::android::hardware::gnss::CorrelationVector correlationVector2 = {
                 .frequencyOffsetMps = 20,
                 .samplingWidthM = 30,
-                .samplingStartM = 0,
+                .samplingStartM = -10,
                 .magnitude = {0, 3000, 5000, 3000, 0, 0, 1000, 0}};
         measurement.correlationVectors = {correlationVector1, correlationVector2};
         measurement.flags |= GnssMeasurement::HAS_CORRELATION_VECTOR;