Android.mk: import LICENSE indicators from AOSP

https://android-review.googlesource.com/c/platform/external/libvpx/+/1858286
https://android.googlesource.com/platform/external/libvpx/+/b35704ee444f6e2533fcbc2efdcb4bd47f5eb912

Change-Id: Ia884434083f85abc291262796c9ff1cd0dcea45a
1 file changed