video: Add support for linear 16x16 NV12 tiles

This adds linear 16x16 NV12 tiled format. This format is exposed
by Conexant Video Capture cards and also Allwinner V3s CSI device.
Note that V4L2 exported the format as V4L2_PIX_FMT_HM12,
prior to being converted to NV12_16L16 nomenclature.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
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