MotionEvent: Differentiate directional support for AXIS_ORIENTATION

Ensure the private flags introduced in this topic do not get sent to
java.

Flag: NONE small behavioral change, where flagging is not required
Bug: 263310669
Test: atest TouchScreenTest libinput_tests inputflinger_tests
MotionEventTest

Change-Id: Ideef3eceaef3d8d2a55a545d23bef5e9e372bac4
diff --git a/native/android/input.cpp b/native/android/input.cpp
index 0a22314..9a8cda3 100644
--- a/native/android/input.cpp
+++ b/native/android/input.cpp
@@ -100,7 +100,8 @@
 }
 
 int32_t AMotionEvent_getFlags(const AInputEvent* motion_event) {
-    return static_cast<const MotionEvent*>(motion_event)->getFlags();
+    return static_cast<const MotionEvent*>(motion_event)->getFlags() &
+            ~AMOTION_EVENT_PRIVATE_FLAG_MASK;
 }
 
 int32_t AMotionEvent_getMetaState(const AInputEvent* motion_event) {