stagefright: update google video codec capabilities

VP9 encoder can only encode at 3-5pfs at 1080p on 2016 devices,
which is not really useful. Advertise only 720p support.

Increase advertised bitstream support to match level claimed
for HEVC decoder and AVC codecs that are used for thumbnail
extraction.

Bug: 64568747
Bug: 64425166
Bug: 31387661
Change-Id: I6e85613826b81fd92aa28c197ae9911be52476b5