Simplify aos::Init

Most of the variants were to deal with core, which has been gone for a
year.  Simplify those all into InitGoogle.

InitGoogle should be renamed to Init at some point.  It does everything
now.

Change-Id: I738ee03e9c5b2e6348ef33302835f915df68011f
diff --git a/y2017/joystick_reader.cc b/y2017/joystick_reader.cc
index a0c20d1..58a3918 100644
--- a/y2017/joystick_reader.cc
+++ b/y2017/joystick_reader.cc
@@ -320,8 +320,8 @@
 }  // namespace input
 }  // namespace y2017
 
-int main() {
-  ::aos::InitNRT();
+int main(int argc, char **argv) {
+  ::aos::InitGoogle(&argc, &argv);
 
   aos::FlatbufferDetachedBuffer<aos::Configuration> config =
       aos::configuration::ReadConfig("config.json");