[Intel-gfx] SandyBridge encoding code merged to libva master

[Zou, Nanhai]

Hi,
	We have merged HW accelerated SandyBridge encoding code to libva master branch.
	At this point we support I frame and P frame encoding for H.264 main profile.
	B frame support, frame rate control, performance tuning and quality improvement will come in next quarter.

	We will provide a simple test program soon to demonstrate how to use the encoding API.

Thanks
Zou Nanhai