Set keyboard type to maximum of all sub devices.

Bug: 216328642
Test: atest KeyboardLayoutChangeTest
Change-Id: Id01a7ea1c766dad0f5c6bb36f61d71a9eafa2d10
diff --git a/include/android/input.h b/include/android/input.h
index fbd61b5..e6ad943f 100644
--- a/include/android/input.h
+++ b/include/android/input.h
@@ -877,6 +877,7 @@
  * Keyboard types.
  *
  * Refer to the documentation on android.view.InputDevice for more details.
+ * Note: When adding a new keyboard type here InputDeviceInfo::setKeyboardType needs to be updated.
  */
 enum {
     /** none */