Make KEYCODE_STEM_PRIMARY a system key.

Bug: 308482931
Test: atest KeyEventTest
Change-Id: I955ca91c550e1c017755feedee4cf2afa810f468
diff --git a/core/java/android/view/KeyEvent.java b/core/java/android/view/KeyEvent.java
index b17d2d1..c6601e8d 100644
--- a/core/java/android/view/KeyEvent.java
+++ b/core/java/android/view/KeyEvent.java
@@ -2065,6 +2065,7 @@
             case KeyEvent.KEYCODE_SYSTEM_NAVIGATION_DOWN:
             case KeyEvent.KEYCODE_SYSTEM_NAVIGATION_LEFT:
             case KeyEvent.KEYCODE_SYSTEM_NAVIGATION_RIGHT:
+            case KeyEvent.KEYCODE_STEM_PRIMARY:
                 return true;
         }