Merge "Predefine U_IN_DOXYGEN in NDK Doxyfile" am: a42cf8d65f am: 322c2d717e am: c53ef484d1

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1782972

Change-Id: Ief189fdfc5cbff26fc9e0919651ea5a09ad56295