Android 7.1.2 Release 1 (N2G47D)
libvpx: Cherry-pick 1961a92 from upstream am: 57e9ae1497 am: 90b12e62bf am: 8202db16f8
am: be649c294f

Change-Id: I81464619f37c48e98804b0c43b0d77b63e3641ae