libvpx

Correctly report "Unsupported bitstream profile"

For vp9 decoder build without profile 2 and profile 3 support, this
commit changes to report error "Unsupported bitstream profile" for
input streams in profile 2 or 3, rather than other misleading error
information.

In addition, one of the invalid files in unit tests is actually coded
profile 2, this commit makes it tested only when the decoder is built
with vp9-highbitdepth.

This fixes issue #1028.

Change-Id: I8b6c1210787c8f89c703a546687dcf973ac20fc0