Split NotifyArgs into a separate file

This way, we can pass NotifyArgs without having to learn about
InputListener.

InputListener, however, knows how to route the args.

Bug: 211379801
Test: m libinputreader_arc
Change-Id: Idf653facd26348fb1ebdf48fb53cf004603587a1
diff --git a/services/inputflinger/Android.bp b/services/inputflinger/Android.bp
index 88a9acb..011cdf8 100644
--- a/services/inputflinger/Android.bp
+++ b/services/inputflinger/Android.bp
@@ -139,6 +139,7 @@
         "InputListener.cpp",
         "InputReaderBase.cpp",
         "InputThread.cpp",
+        "NotifyArgs.cpp",
         "VibrationElement.cpp",
     ],
 }