vaapidec: Add level 5.2 support for h264 decoding
vaapidec: Add level 5.2 support for h264 decoding

ITU approved a new level(level 5.2) to support higher bitrate in 2011-06.
We add this level support now.

Signed-off-by: Zhong Li <ad6bffae321e88d39f25028f12e29bb1c91acd98@intel.com>

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