SetPackagesRecentlyUsed: Fix wrong assumption

INativeDevice.getDeviceDate already returns the device time in
milliseconds.

Bug: 114091593
Test: mmma tools/tradefederation/contrib
Change-Id: If87dfff142ed4c2fda9444674632da725f001f55
diff --git a/src/com/android/tradefed/targetprep/SetPackagesRecentlyUsed.java b/src/com/android/tradefed/targetprep/SetPackagesRecentlyUsed.java
index b2ebb52..39c51a0 100644
--- a/src/com/android/tradefed/targetprep/SetPackagesRecentlyUsed.java
+++ b/src/com/android/tradefed/targetprep/SetPackagesRecentlyUsed.java
@@ -52,7 +52,7 @@
     @Override
     public void setUp(ITestDevice device, IBuildInfo buildInfo)
             throws TargetSetupError, BuildError, DeviceNotAvailableException {
-        long deviceTimeMillis = TimeUnit.SECONDS.toMillis(device.getDeviceDate());
+        long deviceTimeMillis = device.getDeviceDate();
         long deviceRecentMillis = deviceTimeMillis - mRecentTimeMillis;
         StringBuilder builder = new StringBuilder();
         builder.append("PACKAGE_USAGE__VERSION_1\n");