Dual screen touch issue.

jpchen

add patch
+++ b/frameworks/native/services/inputflinger/InputReader.cpp
@@ -3208,6 +3208,7 @@ void TouchInputMapper::configureSurface(nsecs_t when, bool* outResetNeeded) {
     bool viewportChanged = mViewport != newViewport;
     if (viewportChanged) {
         mViewport = newViewport;
+           mViewport.displayId = 0;