Revert "InputMapper refactor: Configure empty InputDevice"

Revert submission 23779328

Reason for revert: Found touch issues on devices in latest qpr-build 

Reverted changes: /q/submissionid:23779328

Change-Id: If3cfc122d571198c8c93c0c5438f70037f8e677e
diff --git a/services/inputflinger/tests/InputReader_test.cpp b/services/inputflinger/tests/InputReader_test.cpp
index 7d157f6..aab8a47 100644
--- a/services/inputflinger/tests/InputReader_test.cpp
+++ b/services/inputflinger/tests/InputReader_test.cpp
@@ -2584,8 +2584,7 @@
     mFakeEventHub->addDevice(TEST_EVENTHUB_ID, "Test EventHub device", InputDeviceClass::BATTERY);
 
     InputDevice device(mReader->getContext(), /*id=*/1, /*generation=*/2, /*identifier=*/{});
-    auto _ = device.addEventHubDevice(ARBITRARY_TIME, TEST_EVENTHUB_ID,
-                                      mFakePolicy->getReaderConfiguration());
+    device.addEventHubDevice(TEST_EVENTHUB_ID, mFakePolicy->getReaderConfiguration());
     device.removeEventHubDevice(TEST_EVENTHUB_ID);
     std::string dumpStr, eventHubDevStr;
     device.dump(dumpStr, eventHubDevStr);