Support YV12 format for ISV functions

In current design, all YUV420 surface will be handled with VA_FOURCC_NV12.
The correct pixel format will be saved in extra_info[8].
VSP driver will indentify YV12 format with extra_info[8].

BZ: 229811
Bug: 17383204


Change-Id: I405b37bbac273e611b7415781b6dc586808b78ba
Signed-off-by: Wang Kun <kun.k.wang@intel.com>
6 files changed