Remove unused parameter displayId

The parameter is not currently used in InputDispatcher.

Test: presubmit
Bug: none
Change-Id: I61f9e6566e4fe77318814e56e73b7f3470fa6a04
diff --git a/services/inputflinger/dispatcher/include/InputDispatcherInterface.h b/services/inputflinger/dispatcher/include/InputDispatcherInterface.h
index 9329ca6..ce7366f 100644
--- a/services/inputflinger/dispatcher/include/InputDispatcherInterface.h
+++ b/services/inputflinger/dispatcher/include/InputDispatcherInterface.h
@@ -126,8 +126,7 @@
      *
      * This method may be called on any thread (usually by the input manager).
      */
-    virtual status_t registerInputChannel(const sp<InputChannel>& inputChannel,
-                                          int32_t displayId) = 0;
+    virtual status_t registerInputChannel(const sp<InputChannel>& inputChannel) = 0;
 
     /* Registers input channels to be used to monitor input events.
      *