[DisplayEventDispatcher] Move DisplayEventDispatcher into libgui.

Original source file was at frameworks/base/libs/androidfw.

For now, libgui will be its new home so that the graphics module can
depend on libandroidfw without pulling in libgui.

Bug: 142760698
Test: builds
Change-Id: Iea51e24ffb11a6ad79ad91a9e887f5e326705f1b
diff --git a/libs/gui/Android.bp b/libs/gui/Android.bp
index 4f605e0..1ae148c 100644
--- a/libs/gui/Android.bp
+++ b/libs/gui/Android.bp
@@ -50,6 +50,7 @@
         "ConsumerBase.cpp",
         "CpuConsumer.cpp",
         "DebugEGLImageTracker.cpp",
+        "DisplayEventDispatcher.cpp",
         "DisplayEventReceiver.cpp",
         "GLConsumer.cpp",
         "GuiConfig.cpp",