Move InputDispatcher code into a folder.

Note this is an intermediate stage so that the following change won't
ruin git history. Should never let the HEAD be this commit.

Bug: 140139676
Test: Builds.
Change-Id: I263929e2d2dd17858eaea69121564335bcc2ef1c
diff --git a/services/inputflinger/tests/InputDispatcher_test.cpp b/services/inputflinger/tests/InputDispatcher_test.cpp
index a86dcbc..8474b1c 100644
--- a/services/inputflinger/tests/InputDispatcher_test.cpp
+++ b/services/inputflinger/tests/InputDispatcher_test.cpp
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#include "../InputDispatcher.h"
+#include "../dispatcher/InputDispatcher.h"
 
 #include <binder/Binder.h>