Adds vp8 profile and levels to MediaCodecInfo.

In line with ongoing effort of adding vpx encoder to
stagefright (https://android-review.googlesource.com/50893)
we need to add profile and level values for VP8.

VP8 profiles and levels are defined in OMX IL 1.1.2
extension headers, which is also being added here
https://android-review.googlesource.com/51272



This alters the public API.

Change-Id: I2bbb91c0b8b522b90c3cdfadaba0d18134800408
Signed-off-by: Kunter Gultekin <kuntergultekin@google.com>
related-to-bug: 8226783