Set the floor value of time estimate as 2017 Jan 01 00:00:00 GMT

- The VTS test checks if the time estimate is a sane value. Thus, any
arbitrary sane value is acceptable. Here we make it consistent to
IGnssDebug.hal, where a comment mentions 2017 Jan 1 as an example of
the value.

Bug: 110094003
Test: make vts, and tested on device.
Merged-In: Ic4f6b597a718ea3e98a67c7939f9e6930d44d224
Change-Id: Ic4f6b597a718ea3e98a67c7939f9e6930d44d224
(cherry picked from commit 5fa43c83e9)

gnss/1.1/vts/functional/gnss_hal_test_cases.cpp

@@ -428,7 +428,7 @@ TEST_F(GnssHalTest, GnssDebugValuesSanityTest) {
             EXPECT_GE(data.position.ageSeconds, 0);
         }
 
-        EXPECT_GE(data.time.timeEstimate, 1514764800000);  // Jan 01 2018 00:00:00
+        EXPECT_GE(data.time.timeEstimate, 1483228800000);  // Jan 01 2017 00:00:00 GMT.
 
         EXPECT_GT(data.time.timeUncertaintyNs, 0);