video-format: Add a new 10bit depth format packed into 20 bytes

Submitted by kevin

Link to original bug (#785384)

Description

Hi,

Currently only have GST_VIDEO_FORMAT_P010_10LE video format. The Y of one pixel will be 16 bits for one pixel. We need NV12 10 bits LE with packed, not 0 pading. The Y of one pixel should be 10 bits for one pixel.

Can you help?