Move displayid into InputEvent

There are certain use cases where key events should be associated with a
particular display. Refactor KeyEvent and MotionEvent to have an
associated display id.

Remove "hasAssociatedDisplay" variable from KeyboardInputMapper,
it just used to mirror "isOrientationAware".

If the keyboard is orientation aware (= it is physically attached to a
display, and therefore rotates together with that display), then
associate that keyboard with the internal viewport. Otherwise, the key
events are not associated with any particular display.

Remaining to do:
- make mInternalDisplay, mExternalDisplay, mVirtualDisplays into a
single vector with type (internal, external, virtual)
- have getDisplayViewport return std::optional (will require deep
changes)

Bug: 64258305
Test: atest inputflinger_tests libinput_tests

Change-Id: I4fe145e74cb59310efaa55bfc9dc3c2b3bd997e3
diff --git a/libs/input/KeyCharacterMap.cpp b/libs/input/KeyCharacterMap.cpp
index cba1111..b561b60 100644
--- a/libs/input/KeyCharacterMap.cpp
+++ b/libs/input/KeyCharacterMap.cpp
@@ -487,7 +487,7 @@
         int32_t deviceId, int32_t keyCode, int32_t metaState, bool down, nsecs_t time) {
     outEvents.push();
     KeyEvent& event = outEvents.editTop();
-    event.initialize(deviceId, AINPUT_SOURCE_KEYBOARD,
+    event.initialize(deviceId, AINPUT_SOURCE_KEYBOARD, ADISPLAY_ID_NONE,
             down ? AKEY_EVENT_ACTION_DOWN : AKEY_EVENT_ACTION_UP,
             0, keyCode, 0, metaState, 0, time, time);
 }